There's a reason why Johnny Manziel is so famous now. Because he beat Bama. People are tired of them constantly winning and the media gave him celebrity status because of the one game he won. I can't even imagine how much coverage he'd have gotten if he did it again.
So instead, Auburn is in that spot because they were the ones who knocked Alabama out of #1 status. It helps their case that it was really late in the season too.