Clearly if not fumbling on a sack is the biggest play of the game there is some major concern over ball security even with you RX. Also acknowledging that him having to think about not turning the ball over makes him less effective is another step in the maybe he doesn't have the awareness needed to be above average as a QB in the NCAA. Does he have the athletic ability to be great? Absolutely, but the bigger part of playing QB isn't athletic ability, its the ability to read defenses pre-snap and the awareness to make the right decisions without having to think about it. And that's the part that is glaring with Spencer Sanders.