He was a huge key - But they also had the number 1 defense in scoring, and yardage (and probably any other metric you can find). It's a team game.
Still not a great example to use a first team all-pro player. But i think the idea is that you can lose a lynch or watkins or whatever... and still be a good team because of the players and environment around them. The broncos, seahawks, steelers, and packers are a good example of this - Yes the QB is a huge part of this, but only if he's the right QB for the team/system.