By far the biggest problem with him was his pass protection. His 97.1 Pass Blocking Efficiency was fourth-lowest among centers. The difference between him and the league’s best center was roughly one pressure per game — which really isn’t much when weighed against his impact in the run game — and he never gave up more than three pressures in a game, so his pass blocking was never a huge problem. I’m also willing to look past his pass blocking due to his improvement. In his first 469 pass blocks he allowed six sacks, a QB hit and 12 hurries. In his last 483 he got that down to zero sacks, one hit and eight hurries.