When the Ute's made their run at the title in 04 they scored 509 points to their opponents 227. They averaged a 25 pt margin of victory and still came in 4th to USC, Auburn and OU who had 1 loss.
BYU would have to have a similar season and pray all other contenders have 1 to 2 losses. The powers that be would have to put BYU in the #1 position after all other team blew up. They couldn't go in on their own merits. The BCS is too corrupt/bias to allow that.
Rackem