Im not going to debate any whose fault is this type stuff. I will say that I think Josh was off in this game. I think a lot of that has to do with everyone else too though. Nobody is helping the guy out. Not the receivers, not the line being fooled by simulated pressures and stuff (dating back to Ravens game,) not even the OC. Even still, I expect him to play better.
Josh's biggest weakness to me is that he doesn't know how to settle down. He gets that clock in his head and it sticks with him the whole game. If he would just slow down a tick I think he would be fine. Even the greats struggle with this sometimes. Rodgers struggles with it now that he is practically a statue. Mahomes and Burrow are great at this. Even they falter once in a while. Its that part of the game that I think those two QBs are better than Allen at.
To me, its the OC's job to get this back on track and keep it there. Its his job to have answers for this type of stuff during games and between games. It's his job to give Allen plays where he can settle down and get comfortable with. He isn't doing a good job of it IMO. Cosell points this out pretty well and more. That guy watches a lot of Bills film and he knows what he is talking about.