Kelly was pissed that he's leaving. Coaches are among the least objective sources there are.
He's more than just a physical specimen. The kid can play the position at a very high level. Looked like a sure fire first overall pick until things completely fell apart for the team, including him, midway through last season. That's a worry, but I still agree with Bruce Arians who said he's the only QB coming out in this draft that has a chance to start as a rookie. And, as I also said, he's coming out too early. Wouldn't risk a top 10 pick because there are too many questions, but he's far and away the best QB prospect in this draft.