You don't need to blame cheating--good game-planning will win every time. Remember, for instance, in the Bills - Giant's '91 superbowl, the Giants' defensive coordinator seemed have all the answers against what had been up til that game a Bills juggernaught offense? That DC game planned so well against Buffalo it was as if he knew what they were going to run in advance. What was that guy's name again? Oh wait, Bill Bellichek, never mind.
(maybe I'm just still bitter but count me among those who believe BB's cheating days started long, long ago)