The past 20 Super Bowl champions have ALL been ranked among the top eight in fewest points allowed. In fact, the Raiders are the only franchise to win a Super Bowl without being ranked in the top eight. And nobody ranked lower than 13th has ever won the Super Bowl.
History tells us that if you don't have the defense to be ranked in the top eight in fewest points allowed, you won't win the Super Bowl, no matter how good your offense is. But if you do, you have a chance to win it even if your offense is below-average.
I found this quote on another board, and the member is extremely astute. I just wanted to share this with you all. Great D wins championships.