For sure. Mechanics is one thing and mental processing is another. Then you have mental makeup which some will argue means nothing. I think it does. Most guys are competitive and some guys are uber competitive. Martz believed this was most important at QB. I tend to agree with him.That does not account for his inability to process after his initial play call is taken away. It also does not account for his lack of feeling pressure, which by all accounts he had in college.