due to coaching. Could be something else. Kizer was the best all around QB that Kelly has had. His decision-making was suspect but again, that’s something that could be also be blamed on coaching but some players have great coaches but still don’t know the difference between a good and poor pass. Book doesn’t have the raw talent that those two had. He arguably has better decision-making skills than Kizer but he throws it away, runs for no gain etc so often that he probably leave quite a few plays on the field as well. Better than a few extra picks? Maybe. It depends on how many plays are being left out there.
You could be right - Kelly might be in his head. Even in his first few games last year he didn’t inspire confidence that he could throw down field on a regular basis though. He had Boykin as a security blanket last year. That’s the biggest difference. And as I said before - Boykin made errant passes look good because his catch radius was ridiculous.