Demeco has understood his offensive line is not good. A great coach makes adjustments to get the ball out quicker. Slowik actually put this in motion and Bills switched up and allowed the run game to work.
I think a little too much is made about running game sucking because of no Mixon. Its as much terrible run blocking, and bad playcalling, as it is bad backup RB's. Mixon certainly is top 10 all around back, but all RB's been getting stuffed on 3/4 run calls past 2-3 weeks. Including Mixon in week 2. Texans do not have an "establish the run" unit. And need to stop doing that