Dude won 4 Super Bowls though. Seems to me that Roeth and Bradshaw were merely expected to try to not lose the game moreso than be a winning piece. Does that make sense?
Pro-Football-Reference.comTerry Bradshaw: Pos: QB, Career: 168 G, 212 TD (36th), 70.9 Rate, 166.6 Y/G, 1978 MVP, All-Pro(1st), 3xProBowl, Steelers 1970-1983, 2x TD Leader, born LA 1948
https://www.pro-football-reference.com/players/B/BradTe00.htm