No it isn't. Any buffoon could tell you that our offense slowed down big time in the second half of 2007. It's not even up for debate. We scored something like 40% fewer points in the second half of that season. Moss slowing down was a part of that.
It wasn't just chance that we played most of our close games toward the end of that year, and it wasn't coincidence that our offense looked so average in the AFC Championship and Superbowl. Maroney stepped up because he had to, and he was finally healthy again.
As for the person who said unpredictability is overrated, the results speak for themselves. If the defense has no idea what play you're going to run on any given play, no matter what your personnel or formation is, how can they prepare for you? No one saw us coming in 2007--that's why we dominated. It's proof positive that unpredictability is essential to a high-scoring offense. It's the entire point of play-action and trick plays. And our failure to change the offense once teams did pick up on us is why we eventually lost the Super Bowl.