I actually don't think it's scheme. We're pretty much running the same scheme as we did in 2017-2020 when we were one of the most dominant run defenses in the league, and we almost broke an NFL record for consecutive games holding a rusher under 100 yards. Onyemata was a stonewall in the middle and was a key reason for that, he was so disruptive in the run game. I think losing him definitely hurt.
I think right row we're definitely missing a force in the middle, and we're not as strong at LB as we once were. Demario's age is starting to show, and I don't think our safeties are very good disrupting the run game, Mathieu included.