If Vick were to tweak a knee or for whatever reason had to wear a knee brace, he would wither and his offense would sputter through the air. You put a knee brace on Rodgers and he's still likely to throw 4000 yards and 30 TD's. Vick is just not a great passer. Honestly, the way he whines all the time, I question whether he's a good leader. He's always trying to blame somebody for something.
A QB is absolutely defined by his passing ability . Tebow will never ever be in the "Great QB" discussion because he's a terrible passer. QB's are leaders by default anyway. Any QB worth his salt takes charge of his team. I don't think you can be a great passer and a bad leader. They go hand in hand.
Vick will never be a great QB. He will never be in the discussion for the HOF.
You can trot out all the metrics and weird DVOA stats you want. It's just the way it is.