This can be difficult to quantify, but you want the ideal quarterback to have the respect of his teammates, having proven himself to be someone who can carry the offense when necessary. Brady did that with his first season as a starter in New England and has since cemented himself as one of the best in this category. Of course, the more you win, the more effective you are as a leader. Some might wonder if the ball-deflation scandal will hamper Brady's ability to lead, but I don't see that as a factor; players in a locker room have a special bond, and they won't be affected by that at all. Classic example: Lynn Dickey.