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Controversial Chiefs rookie tabbed impact player who could boost defense instantly

One NFL Draft analyst endorses Kansas City's rookie defensive end.
Sep 20, 2025; Norman, Oklahoma, USA;  Oklahoma Sooners defensive lineman R Mason Thomas (32) reacts after recording a sack during the third quarter against the Auburn Tigers at Gaylord Family-Oklahoma Memorial Stadium. Mandatory Credit: Kevin Jairaj-Imagn Images
Sep 20, 2025; Norman, Oklahoma, USA; Oklahoma Sooners defensive lineman R Mason Thomas (32) reacts after recording a sack during the third quarter against the Auburn Tigers at Gaylord Family-Oklahoma Memorial Stadium. Mandatory Credit: Kevin Jairaj-Imagn Images | Kevin Jairaj-Imagn Images

It feels like the concerns surrounding Kansas City Chiefs rookie defensive end R Mason Thomas' scouting profile have seemingly vanished out of thin air. He's generated buzz, even garnering attention from the club's future Hall of Fame tight end, Travis Kelce — who's far from the only one.

Not long ago, there were valid questions regarding Thomas' size (or lack thereof) and one-dimensional skill set. However, excitement regarding his arrival in Kansas City is mounting before he logs a snap, with ESPN's Jordan Reid being the latest advocate.

Reid spotlighted five first-year pros "who could have a big impact despite not being picked in Round 1," and Thomas was among the bunch.

"The Chiefs have lacked pass-rush consistency throughout the Patrick Mahomes-Andy Reid era, and Thomas is tailor-made to step in as an impactful designated pass rusher," Reid wrote. "He has one of the better motors and pass-rush repertoires of any prospect in the 2026 class."

NFL Draft analyst endorses Chiefs rookie DE R Mason Thomas as immediate contributor

Talk about a narrative shift. Thomas' shorter arms (31 and 5/8-inches) and slender frame (6-foot-2, 241 pounds) were talking points during the evaluation process. Suddenly, the No. 40 overall selection in the 2026 NFL Draft is considered an "underrated" newcomer and instant difference-maker, at least in Reid's eyes.

While Thomas' physical limitations show up in more ways than one, his speed and ability to get to the quarterback are eye-popping. He has an explosive first step, plays with great energy and has good bend. The former Oklahoma standout may ultimately prove to be a pass-rush specialist, though that's more than enough to help the Chiefs, as Reid touched on.

Veteran George Karlaftis III is locked into one starting edge rusher spot for the Chiefs, but the opposite side is up for grabs. Thomas has a clear path to significant snaps from the jump; he'll compete with 2025 third-round choice Ashton Gillotte and 2023 first-rounder Felix Anudike-Uzomah.

Thomas will get every opportunity to climb the Chiefs' depth chart. Michael Danna's release and Charles Omenihu's departure in free agency have created a significant void at one of football's most important positions.

Injuries derailed Thomas' freshman and sophomore campaigns at Oklahoma, yet he showed his upside when healthy. The 21-year-old recorded a combined 22 tackles for loss, 15.5 sacks and four forced fumbles over his final two collegiate seasons.

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