It's almost always relevant to bring up passer rating. And the exceptions only serve to prove the rule. Since 2000, BYU has played 131 games. The team that has had the better passer rating is 114-17 (.870). There is NO other stat out there with a better correlation of winning than that. Time of possession certianly doesn't have that kind of correlation.
Saturday was only the 2nd game in the last THREE years, and just the ninth under Bronco, where the team with the worse passer rating won the game. Of those 17 games where the team with the worse passer rating won, BYU was the victor in only six of them - although five of the six have come under Bronco.
BYU's defense played just well enough to keep SDSU below the 140 passer rating threshold. When BYU gets to 140, they're 55-6 (.901) since 2000. Our opponents when they get to 140 is 8-4 (.750).
But in short, we beat the odds - big time. If you gave me an .870 chance of winning, I'd take it every time.