"Weak minded"? "Heart of a champion"? Why? Because you don't like his postgame press conferences where he's told to say nothing just like his head coach and GM?
Mark Sanchez' turnovers happen for a simple reason that everyone likes to overlook- he's trying to make a play while running for his life. And when you don't have playmaking receivers and you instead have a porous offensive line, it's all over anyway.
Mark Sanchez is a symptom, not the problem.