No better way to learn then by playing. You either will have it at QB or you wont, sitting will not make you better. You still learn the same monday-saturday. Brady, Brees, Rodgers all would have been fine starting day one.
Nope it doesnt mean any of that. Rodgers would have been good from day one, hell only reason he was on the bench was b.c he had a HoF QB in front of him. Brees didnt even sit a full season, Brady would have been good front he beginning.