Most SB winners have a QB that can get it done. Go back to the 70s and almost every QB is a HOFer. Bradhshaw, Staubach, Montana, Young, Aikman, Favre, Brady, Elway, Manning. The thing is, we pay Carr to be great. He was the #1 pick. The QB is in charge of calling audibles, reading defenses, making plays in the pocket and managing a game. He isn't supposd to be average and with the salary cap and parity you can't count on surrounding a guy with a perfect team. That is a pipe dream. The QBs on the teams you mentioned were a little above average too and had shown something. It isn't the norm. I'm not wasting cap space for average when you can get someone for the future that can help carry you. At some point your QB has to win you a few games.