I think Brady is overstating it a bit, but you can call it pressure, comfortability, fear ...whatever. There is certainly a mental element to playing in the NFL. And I consider that kind of thinking as a talent as well. Some good players want all the challenges, all the spotlight, etc. And I would wager a large majority of practice squad players don't, and aren't ready for those challenges. They are less talented in all aspects of the game including the mentality of dealing with the NFL spotlight.
In theory, good teams would have people that could help these players rise above that "good enough" mentality and actually contribute.
