You don't find any indication of bad coaching for someone who has coached for 40 years? Disorganized substitutions, defense not set against hurry up, LB's covering wide receivers, no one covering TE's/RB on pass patterns, sticking with JMc at QB, only using one RB. This team has played very poorly, answer is it it "addressable" by further practice. No reason to give up over 400 yards passing to so many teams, just bad coaching. After the 1st time Pitt receiver ran underneath open should have addressed.
There is no way this offense can play against pressure, especially as the field gets smaller into the red zone. Defenders can sell out to cover short passes and WR's 1st move and rushers have no need to protect against a moving QB; only screens and draws will keep them honest and harder to do on shorter field. I put this on coach selecting a QB that can't actually do it (which is initially ok, Cassell at USC couldn't beat out Leinart but the latter actually played ok) but more importantly, then in spite of all the proof to the contrary, sticks with him.