Is that he never had Nix's athleticism and physical strength. Also as much flak as Nix deserves for his dependency in that offense on screens and horizontal type plays busting big yards, he did show an ability to get the ball out quickly and move the chains. And when he does go over the top he can stretch the field.
Problem of course is that a guy like him isn't comfortable holding it and looking deep. Which means he's not my preference of QB and I am pretty sure not McVay's preference either since he does appreciate stretching the field. But if we get to say that round 3 comp pick and Nix is sitting there... I do wonder if they take him.
Lot of it probably comes down to that whiteboard session with McVay though of course. Clearly Nix has enough talent to play at this level, just a question of whether he is a Shanny type who has to live underneath.