Trubisky was "ruined" due to the fact we started him as a rookie. We should have kept him on the bench until he died of old age. Then he'd be a Hall of Famer. LOL. LOL at the over-reaction to 1 game here :-)
I still remember how good Jim Sorgi was because he sat behind Peyton Manning all those years. He really tore up the league when it was his turn at the helm. GOAT, that Jim Sorgi.
You can make a list from recent memory:
Sorgi All of Brady's back-ups (maybe exclude JimmyG) The guy the Texans got that threw like 13 pick-6s in one season Matt Flynn Charlie Whitehurst Brock O
Everyone thought these guys were going to be the man because they sat and learned. One of the dumbest myths is drafting a QB to sit and develop ans then trade him. It actually happens a lot less than we think. Even in NE.