He hasn't shown the skills to be a pro QB. Good arm but low release and limited accuracy. There are lot's guys like that. Someone will draft him in a late round just based on athletic ability, but he would be a project player at another position like TE and the Bills need immediate help there.
The Bills need linemen not a QB. I know that's been the case for like 10 years, but they've got to keep trying. Let's use half our picks on linemen. We've got to get a couple of them right.