I might not agree with the statement about not winning your conference. I can see a team losing an early season tie-breaker game to an in-conference rival, missing out on the title game because of it, and then getting into the NC game because the rival tie-breaker owner lost in the Conference title. It's happened before. See Nebraska 2001.
What about a conference champion, undefeated, in a BCS conference, not getting into the NCG? Auburn 2004? Ok, that one was alright....
No way the voters would allow a rematch to happen, unless Bama wins this game in such a thrilling fashion that fans just want to see it again. Still, you have to think that regional bias would come into play. Texas won't lose, but if they did, somehow....It's TCU against the SEC champ.