You are missing my point.............the QB is not always the reason you win a SB, many teams have won a SB because of the defense they had and all they asked the QB to do was hand off the ball and not throw a pick........they had bus driver QBs, like Trent Dilfer.
Perfect example, the Chicago Bears...........they made it to the SB despite having a QB with the lowest QBR in the entire league that year in Rex Grossman. Yea, they lost the SB to the Colts, but if they would have won it would not have been because of Grossman, it would have been because the Bears had the number one rated defense in the entire league and won almost every game DESPITE their QB, not because of.
That's my point!!!! You cant just look at the team that wins the SB and say, "I want that QB". That totally ignores how a team is even structured.