He thought he could throw 30 yards into the end zone off his back foot. He thought he could throw accross his body with a defender giving chase. He thought he could take inside linebackers head on without sliding. He thought he could outplay everyone--even with a broken vertabrae. I don't think there is anything he thought he couldn't do.
Had he understood his deficiencies and played within his ability, the team would have been much better.