Just the scenario within the SEC is hard. Alabama wins out, Tennessee beats Georgia this weekend and loses to Bama, no other upsets. Could happen, but wouldn’t bet it.
Ohio State/Michigan would have to be a blow out for one team to knock the other out of the conversation.
TCU has to lose.
USC/Oregon/UCLA would have to eliminate each other or USC has to lose to ND.
Clemson has to lose (I actually think this is pretty likely) and it probably has to be ugly.
Then there is more long shot stuff like what if UNC or Illinois (I know I know) win out.