Doug Donley. If he catches Danny White's third and seven pass in the 1981 Championship Game, then the Dwight Clark catch never happens. I just knew when he dropped it we would lose the game. It was much like Wes Welker's drop in the 2011 Super Bowl that gave the Giants the ball with enough time to pull out the win.
I have always wondered how Danny White's legacy would have changed with just that one catch. We were a better team than Cincinnati that year so I think Danny gets his first ring and who knows what happens to his career from there.