Why not Ken Stabler?
From Wiki:
Stabler was the fastest to win 100 games as a starting quarterback, having done so in 150 games, which bettered Johnny Unitas’ previous mark of 153 games. Since then, only Terry Bradshaw in 147 games, Joe Montana in 139 games and Tom Brady in 131 games have reached 100 wins more quickly.[5] Stabler is also the only quarterback from the NFL’s All-1970’s team not in the Pro Football Hall of Fame. In a recent NFL feature listing the top 10 players not in the Hall of Fame, Stabler was listed at number six, partly due to his off-field scandals,[6] which in the 1970s were less prominent, or it could be that he never emulated the success he achieved in Oakland.