Fumbles are one thing for JT and it is a legitimate concern, however I think a general mindset to force every play was his biggest downfall. He just simply took too many chances forcing pitches and passes into risky situations. Good QBs know when a play is over or isn't there at all. He just needs to learn that. I am optimistic he will.
JT drove me a bit nuts last year. A world of potential IMO but reckless with the ball. Risky pitches often worked but a scary habit to fall into. More importantly he too often carried the ball like mike vick...that makes me insane. Both are easily correctable.
The loaf of brad carry and in the grasp pitches are great when nothing bad happens... unfortunately the odds of fumbling go up dramatically with those traits. I'm sure that the coaching staff is reminding JT that ball security is imperative.