re: The "not ready" or "he will be ruined" are the dumbest excuses, I'll prove it

The problem with playing a QB before he is ready is that the QB develops bad habits. The more the bad habits occur, the more difficult it is to break the QB of the bad habits.

Bailing out of a clean pocket is one example. Inexperienced QBs tend to bail when they "feel" pressure even when it's not there. It takes maturity and trust to stay in a pocket. It's one of the harder things to teach a QB. It's much easier to develop this skill at practice under controlled circumstances. It's a very hard habit to break.

Improvising rather than running the play called is another example of a bad habit that QBs can get into. No doubt that improvisation can be good when the play breaks down; however, some QBs tend to improvise too early or too much. It's easier to defend a QB who improvises too much, and improvisation can lead to all kinds of bad things: throwing into additional coverage, throwing into unexpected or unseen coverage, throwing across your body late on a play, foregoing check downs, improper throwing technique, etc.

FTR: I'm not saying that any QB will be ruined by playing too early. However, I’ll let the coaches who get to see Harris and Jennings everyday make that decision.