Few units in college football needed a makeover more than Oklahoma State’s defensive line. After a 2024 season in which the Cowboys were repeatedly gashed on the ground—allowing 300 or more rushing yards in three games and surrendering three or more rushing touchdowns in seven—they entered the offseason with a clear mission: fix the front seven, or face another year of mediocrity.
The urgency was warranted. Oklahoma State’s inability to stop the run often turned winnable games into shootouts, or worse, blowouts. In a conference filled with increasingly balanced offensive attacks, it simply wasn’t sustainable. That’s why the Cowboys hit the transfer portal with purpose, seeking proven, experienced, and physically dominant defenders to shore up one of the most vulnerable parts of their roster.
A Fresh Look on the Edge
The most exciting addition is edge rusher Kyran Duhon, who transferred in from UTEP after racking up 43 tackles and seven sacks in 2024. Duhon brings not just production but explosiveness—something the Cowboys desperately needed to pair with returning rotational players like DeSean Brown and Landon Dean. While Oklahoma State’s pass rush wasn’t the root of their defensive struggles last season, it lacked consistency and the ability to get off the field in key situations. Duhon, a sophomore with high upside, could help turn pressure into game-changing plays.
Also expected to contribute are Taje McCoy, a transfer from Colorado, and redshirt freshman Armstrong Nnodim, who missed last season due to injury but was a standout in camp before going down. With a new defensive coordinator in Todd Grantham, the scheme will emphasize aggressiveness and disruption—meaning edge players who can win one-on-one battles are now more important than ever.
Size and Substance on the Interior
Perhaps the most critical upgrades came in the middle of the line, where Oklahoma State needed to add size and depth in a hurry. They did just that with De’Marion Thomas, a 333-pound nose tackle from Vanderbilt who brings SEC experience and the ability to anchor the run defense. Thomas is expected to be a plug-and-play starter from Day 1 and should immediately help reduce the gaping holes that plagued the Cowboys last fall.
Joining him is Michael Diatta from Virginia, who offers quickness and versatility. Oklahoma State also returns Iman Oates, a 315-pound veteran who provides leadership and familiarity with the program.
Still, the group took a hit when Justin Kirkland, who had been a staple on the interior over the last two seasons, transferred to BYU. Kirkland brought size, reliability, and experience, and while he never flashed as a pass rusher, he led all interior linemen on the team in tackles last year. His absence leaves a leadership void that Thomas and Oates will need to fill quickly.
Waiting on the Breakouts
Beyond the headline transfers and veterans, Oklahoma State is hoping for meaningful contributions from a handful of younger players who’ve been in the system but have yet to fully emerge. Defensive tackles Jaleel Johnson, Aden Kelley, and DeSean Brown have all seen playing time in spurts but need to become more impactful, especially in rotational roles. Brown, in particular, looks the part physically and could take a big leap under Grantham’s more aggressive approach.
Armstrong Nnodim, who, if healthy, could also be a long-term building block on the interior. Developing these younger, or less experienced, players is essential not just for 2025, but for the future of the defense as a whole.
A New Identity Under Grantham
Everything about Oklahoma State’s defense will have a new feel in 2025. With Todd Grantham now calling the plays, the Cowboys are expected to lean more into chaos—bringing pressure, disguising looks, and trying to create turnovers instead of sitting back and reacting. For that to work, the defensive line must be more than just improved—they must be disruptive.
The stakes are even higher given the overall roster turnover. Since the 2024 season ended, the Cowboys have experienced significant roster churn, with more than 50 players departing through graduation, the NFL Draft, or the transfer portal. In many ways, 2025 marks a reset for Oklahoma State, and whether that reset leads to success or more struggle will depend heavily on the performance of the rebuilt defensive front.
Conclusion: Hope Meets Reality
On paper, the Cowboys made the right moves. They brought in size. They brought in experience. They addressed both the edge and interior. But rebuilding a defensive line isn’t just about stacking talent—it’s about cohesion, technique, and toughness. For Oklahoma State, this is a group with clear potential and far better depth than a year ago. But until they prove they can stop the run against the Big 12’s best, cautious optimism is the only reasonable stance.
If this group comes together, Oklahoma State’s defense could surprise. If not, it may be another long season in Stillwater.
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