Stringer,
I keep asking myself that very same question.
My best guess would be that the UT players are pretty much psyched out and/or intimidated. You can watch them play every game of the year, and when you watch them play OU, the UT defense doesn't fly to the ball, they seem to play more cautiously against OU. That is not meant to take anything away from OU, it means that Mack Brown doesn't get his players prepared emotionally or mentally and it shows.
to USC and congrats on winning the national title. Tonight, IMHO, you demonstrated clearly that you are the best team in college football this year.