Unfortunately players are judged not just on their performance but the "measurables" that draft talking-heads always discuss, success of their team, schedule of opponents, history of their school...that's why it always surprises people when players like Brees, Russell Wilson, Darren Sproles, etc. succeed. They just didn't fit the mold of the prototypical player.
When you put everything together for the ideal QB, you get someone like Sam Darnold who went to a school with pedigree (USC), had the right height, weight, and was drafted third and projected #1 since last year even though his performance this past year was just so-so. Yeah, Mayfield may be 6' or just under, but his performance, OU, Big-12, and persona thrust him to the Heisman and from there to the Browns at #1.
For Fine it's the combination of his size, perception of UNT, and C-USA that will sadly outweigh performance. Maybe he could get away with his size were he at Michigan or Clemson, Georgia or Oregon, or if he was 6'4"/225 lbs. and here he'd get consideration from teams, but those are not reality.