Who’s to Blame for What we saw today

What did he do why he was in there. One td. This is on our o Coordinator.
He did great given that horrid OL in front of him. This loss is on the OL. Its been bad from the start and today it caught up with them. Unfortunately, it cost us our starting QB as well as a game. My question is why hasn't this been addressed? Because DA doesn't know how?