If they do happen to win the SB, Brady (and Gronk, and Bill?) would very likely retire (on top). So there is that. I think Brady would have retired if they won it last year. That's why he was crying like a little girl on Gazelle's shoulder after the game... his plan got delayed. So, first preference would be to get destroyed by KC, but second choice (if they beat KC) would just be to win it all and ride off into the sunset.