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.