Great point and we should, as a board, call this out and debunk it as much as we can otherwise it just constantly festers in the background until it rears its ugly head again.
A lot has to do with football IQ and their competitive drive to get better, provide they have the natural athletic talent to go with it. NFL history is littered with athletic specimens that don't have a brain in their skull or don't care to hone their craft. The NFL actually has a lot of marginal athletic talent, but high football IQ and a strong fire within playing at good levels. Obviously the players with very poor athleticism washout as well.
The definition of a "deep" draft is my biggest pet peeve right now LOL.