I think he has a "lazy" arm, meaning that he doesn't get the full power from his arm, and I think it is because he takes what appears to me as really long strides. I see you stated that he throw well from hash to hash, I think he throws a wobbley ball and would be picked off by NFL CBs. I think he would need to develop (what I call) the Joe Montana/Kurt Warner affect, he'll need to learn to read defenses so well that he knows where the ball is going at the snap. I don't think he has had to read defenses and isn't terribly accurate with the long ball. Now I am going off watching him play probably 4 or 5 games this year, and 3 or 4 last year. I think he has a very low floor and a medium ceiling. Boom or bust pick that I feel would be a 3 rounder in most drafts, but could move up to the 2nd because of the first round run in QBs.
That is why I think he is not the talk of the town, because he sure looks the part. I got to say too, I am rooting for this kid, he comes from a football family, and by all accounts seems to be a good kid.
I watched him vs Mayfield in the Ok game. He looked pretty good. I didn't see a wobbly ball. He hit a few in stride on the seam routes.