Growing optimism surrounds the Kansas City Chiefs’ pass rush heading into the 2026 NFL season, and a lot of that has to do with second-round rookie defensive end R Mason Thomas.

During the team’s Week 2 preseason game against the Tampa Bay Buccaneers, Thomas played 15 defensive snaps and won practically every single one of them. Through two preseason games, Thomas is tied for the third-most pressures in the league with seven, according to PFF. He’s still searching for that first sack, but the disruption is undeniable.

Thomas is rushing the passer with speed, quickness, bend, and ankle flexion the Chiefs haven’t had in several years. He’s proving to be the full package at edge rusher, setting the edge well thus far. He is doing his job on blitzes, twists, and stunts. Through two preseason games and everything he’s shown at training camp, Thomas has shown practically everything you could ask for from a rookie.

Some might question the level of talent he went against, with the Buccaneers’ starting tackles sitting out for the game. However, this has been consistent throughout all levels of competition Thomas has faced. Kansas City’s running backs coach, DeMarco Murray, helped evaluate Thomas coming out of the University of Oklahoma, and some intangible talents proved hard to ignore.

Peter Woods recognizes the impact R Mason Thomas brings to the Chiefs’ pass rush

The coaching and front office staff aren’t the only ones who’ve noticed what Thomas can do. His first-round teammate, rookie defensive tackle Peter Woods, spoke about what Thomas brings to the table as a pass rusher in Kansas City.

“Yeah, it’s been there all camp,” Woods said. “You know, it’s something I am obviously very excited about. He’s (R Mason Thomas) got some stuff that you just can’t teach anybody. That makes my job easier. That makes everybody around him’s job easier, and that’s going to make him a better player. You know, being able to use those things that are just God-given that he has. So, I am really excited about it.”

While Thomas hasn’t yet recorded his first NFL sack, it feels like only a matter of time before he gets there. Woods knows that having Thomas on the field makes his own job along the interior defensive line so much easier. Woods played 18 defensive snaps during Saturday’s loss to Tampa Bay and made progress himself. Some of that can be attributed to Thomas’s edge performance.

One play in particular showed the Thomas-Woods combination at work

One play in particular illustrated the pairing’s potential. Thomas flushed quarterback Jake Browning out and to the right, allowing Woods to put pressure on Browning before he released a short pass. It was the kind of complementary rush the Chiefs are counting on from their two rookie defensive linemen this season.

There’s a whole lot of promise on the defensive line at both the interior and edge rusher positions after the 2026 NFL Draft. The Chiefs couldn’t say that a year ago. That’s all thanks to the talents of both Thomas and Woods. If their preseason and training camp performances are any indication, Kansas City’s defensive front could look dramatically different in 2026. Preseason Week 3 is next for this duo of rookies, but proving it when the games start to count will be the true test.