If Auburn losses than I truly believe that TCU will play in the championship game
My reason: back in 2001 the BCS allowed Nebraska who never won their conference championship game into the BCS championship game and they got their a** kicked so the BCS will not allow this to happen again!!!!
if both Oregon and Auburn lose then Stanford or Wisconsin will play TCU
If Auburn loses, and TCU wins, nothing will change. They are a very distance 3rd, and it's no accident. Nothing can prevent the Auburn/Oregon championship matchup.