Christian Parker is giving Cowboys' defense a makeover. What will that mean for the NFL Draft?

“I would say being multiple is probably the most important thing.”

Parker was resolute — if not quite as cavalier as Bill Parcells 20 years ago, who “walked down the hallway and said, ‘Boys, we’re switching,’” then-Cowboys quarterbacks coach Sean Payton remembers.

Then-defensive coordinator Mike Zimmer, whose background was in 4-3, was becoming a 3-4 play-caller.

“It wasn’t much conversation,” Zimmer told Yahoo Sports.

This Cowboys shift is different, coming from the coordinator up rather than the head coach down.

Nonetheless, two decades after the Cowboys took two seasons to feel like their personnel makeup and player buy-in could successfully green-light the transition from a 4-3 defense to a 3-4, Dallas is at it again.

The 34-year-old who has coached under top defensive minds Vic Fangio, Vance Joseph and Ejiro Evero plans to blend a background in exotic fronts and shutdown secondaries as he aims to compel a struggling Cowboys defense to threaten like its potent offensive counterpart.

Cue the addition of some key personnel, the evolution of some returning players and a step-by-step development plan? The Cowboys are banking on the combination to help them contend in 2026.

The next step in that process comes Thursday night, when the Cowboys currently own the 12th and 20th picks.

Jerry Jones did not promise Parker both first-round picks would go to defense when he was hired. But Parker was asked at his Feb. 18 introductory news conference whether he would advocate for that.

He didn’t hesitate: “Absolutely.”

It will not be surprising if he wins his case.

New Cowboys DC: ‘Sometimes, players got to touch the stove’

The 3-4 defense has surged in recent years, responding in part to offensive principles from the Shanahan-McVay system that emphasizes outside-zone runs. Twenty NFL teams are currently employing 3-4 base defenses, an NFC talent evaluator who tracks schematic trends told Yahoo Sports. Twelve are running a 4-3.

Neither scheme is inherently or indisputably dominant, coaches and evaluators say. But 4-3 defenses, which front two defensive tackles and two defensive ends, tend to create more pressure on the quarterback and allow players to penetrate more simply in order to generate maximum pressure.

Three-four defenses, meanwhile, tend to front bigger and stronger players as the three defensive linemen are often asked to defend two gaps (two spaces between offensive linemen) each, thus requiring more size and stoutness.

Coordinators implementing a 3-4 prefer bigger players as well as players who can read and react sharply, given the complexity of accounting for two gaps and determining exact responsibilities after the snap requires a high level of communication and processing in order to fulfill assigned responsibilities before it’s too late.

Parker has explained that vision and those needs to the Cowboys' draft room in recent weeks, sources said.

“He’s so detailed when it comes to explaining things,” one Cowboys front-office member told Yahoo Sports. “It's the best I've been around as far as communicating what he wants, what his vision is for the guy.

“Right now, we're like in a honeymoon period. But it's been amazing.”

Like in his initial Zoom and in-person interview, Parker has walked evaluators through the traits he values and his plan to develop prospects. In three seasons with the Denver Broncos, Parker helped develop defensive backs including two-time All-Pro cornerback Pat Surtain II. In Philadelphia, he tutored Quinyon Mitchell and Cooper DeJean into All-Pro honors within their first two pro seasons.

Parker helped DeJean grow in his spatial awareness and route feel at nickel cornerback, an Eagles colleague told Yahoo Sports, while helping Mitchell learn press coverage and refine both his transition footwork and his combativeness at the point of attack. Parker, the Eagles’ defensive backs coach as well as defensive pass game coordinator in 2024 and 2025 under Fangio, instilled confidence in each player. Parker wasn’t afraid to give them extra quizzes or footwork drills outside of practice when he thought it’d help.

“You have to know the student first and foremost,” Parker said of his teaching philosophy. “What might hit one player’s brain is going to hit different than another. So being thorough and detailed, being very clear and concise in terms of your messaging and when to correct, when not to correct.

“Sometimes players got to touch the stove. You just want to do it in a controlled environment.”

The Cowboys’ front seven, making a major transition, may need a couple extra touches this spring.

Will 3-4 help Cowboys D more against run or pass?

Transitioning from a 4-3 to a 3-4 can sometimes take longer than the opposite direction, coaches say, because of the size required to make that transition.

Edge rushers in a 4-3 system don’t need to drop in space and coverage as much as outside linebackers in the 3-4 system. Front-seven length is key to help ward off blockers on screens as well as to tackle. Whereas 4-3 defenses often value speed and twitch up front, 3-4 defenses prioritize strength and stoutness against the run.

“You’re changing your F1 car’s body type,” Payton told Yahoo Sports. “The Cowboys' race is that: the transition from an even to an odd front.”

A transition was needed after the Cowboys followed up three top-10 scoring defenses under now-Commanders head coach Dan Quinn with cellar-dwelling consecutive seasons. After allowing the second-most points and fifth-most yards in 2024 under Zimmer, the Cowboys' defense allowed the most points and third-most yards last season under Matt Eberflus.

Losing Micah Parsons a week before the season opener didn’t help matters. But Parsons’ absence was far from the only problem for Dallas’ defense last year. The Cowboys hope their new scheme will make them sturdier against the run, thus leaving teams more one-dimensional.

“You affect the quarterback by stopping the run,” Parker said. “Sometimes affecting the quarterback comes through pressure, sometimes it comes through disguise, sometimes it comes through just the talent that you’re able to have and the ability to play the play style.

“If you can stop the run, you can get teams in predictable downs.”

Expect the Cowboys also to bring their outside linebackers to the line of scrimmage outline, presenting five-man fronts that muddy quarterbacks’ defensive reads.

The Cowboys have already shifted some personnel to anchor the transition. The Cowboys dealt the 6-foot-3, 250-pound Parsons to the Green Bay Packers last August in exchange for two first-round draft picks and 6-3, 314-pound interior defender Kenny Clark.

The Cowboys then dealt first- and second-round picks and defensive tackle Mazi Smith to acquire 6-4, 303-pound defensive tackle Quinnen Williams from the New York Jets at the trade deadline. They traded a fourth-round pick for 6-5, 277-pound edge rusher Rashan Gary last month. And for a third-round pick, the Cowboy sent the 49ers the 6-2, 280-pound Osa Odighizuwa and his $20 million per year salary in a move that returns Odighizuwa to a 4-3 front where his size and speed can offer maximum value.

“We’ve made a conscious decision to be a blend of the equivalent of the 3-4,” Jerry Jones said. “The 3-4 concept can give you a better run support. And the question is, can that outside guy do a little pass covering, cover a little space, plus give you the pressure on the outside?

“When you see a player [who can] get some pressure on the outside, slide out in that flat and to cover that flat for you, that's a rare dude. He's important. And it's hard to do.”

But there are players on Thursday night who can help.

Cowboys’ new vision changes how they value draft traits

Right now, the Cowboys’ projected starters at outside linebacker would be 2024 second-round pick DeMarvion Overshown and 2025 second-round pick Donovan Ezeiruaku.

Zimmer touted Overshown’s acceleration as a trait that will help him with sideline-to-sideline pursuit at outside linebacker. Jerry Jones said last month that Cowboys decision-makers agree Ezeiruaku should have played more last season than he did, the franchise confident in his ability to create more pressure and pass rush than he’s shown so far.

With the trade of Parsons, as well as the midseason death last year of 2024 second-round defensive end Marshawn Kneeland, expect the Cowboys to target additional edge rushers in the draft.

Front seven help could come as early as Thursday night, the Cowboys more malleable than usual with the 12th and 20th overall picks that could land two immediate contributors or be packaged to move up for one of the best defenders in the draft.

“You can’t go wrong taking big, long, athletic guys,” one Dallas evaluator said. “That’s what we want to get back to.”

There are players who would have fit the Cowboys regardless of their scheme. Texas Tech edge rusher David Bailey, Ohio State versatile linebacker Arvell Reese and Miami edge rusher Rueben Bain Jr. (evaluators consider his quick hands and lower-body strength sufficient  to compensate for his lack of length) are talented enough to transcend any system and elevate a defense regardless of base front.

Inside linebacker, often the irreplaceable defensive quarterback and top communicator, is a glaring need for the Cowboys to fill either in the draft or free agency. (When asked if he would be comfortable with a rookie leading Cowboys defensive communication, Jones said “yes, yes, a big yes.”) And the Cowboys value more depth at corner, both for the ability to play nickel and because of Parker’s track record developing the position.

As the draft goes on, there are some players whose value to the Cowboys have changed because of their schematic shift.

Missouri edge rusher Zion Young, for example, would have been valued more highly under the Cowboys' 4-3 system. Yahoo Sports draft expert Nate Tice rated him 36th on his overall big board, but he fits the Cowboys less than he once did.

Texas Tech edge rusher Romello Height, on the other hand? The 66th player on Yahoo Sports draft expert Charles McDonald’s board would have been considered too light for the Cowboys’ ideal 4-3 defensive end profile but could now offer more value as a stand-up outside linebacker.

The Cowboys’ young coordinator with a shoe collection that has left impressions in buildings across the NFL will influence who leaves the board at 12 and 20 on Thursday night — if not sooner, should the Cowboys choose to package the picks and trade up.

And if the Cowboys can pair an improved defense with an offense that last season ranked seventh in scoring and second in yardage?

Expect Parker’s stock to continue to boom.

“He has a great chance to look good because he’s not coming in with a Super Bowl defense,” Jerry Jones said. “Should he end up with one, then he’ll look like one of the greatest defensive-minded coaches there is.”

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Jori EpsteinSenior reporter

Jori Epstein is a senior NFL reporter for Yahoo Sports and the author of 'The Upstander: How Surviving the Holocaust Sparked Max Glauben's Mission to Dismantle Hate.' She previously reported for USA TODAY and The Dallas Morning News. Follow Jori on Twitter @JoriEpstein.](/author/jori-epstein/)