It's got to be over a thousand , i can come up with almost 500 just with bart starr , scott hunter and kenny stabler.
Then add to the mix , Harry Gilmer , Pat Trammell , Steve Sloan , Namatth , the Ruteledge brothers , richard todd , mike shula and Brodie Croyle. ... and back-ups who got spot starts Jay Barker , Greg McElroy and jp wilson.
I'm sure there are a few i'm forgetting and probably some from before the 50's that i dont know about.