Folks may disagree but I don't think TCU is the team we need to be watching for that 4th spot. I think Texas gets em next week. The team we need to be wary of is Oregon. They're hot and right on our heels. We'd better be really impressive these next 3 games.
A one loss Oregon (PAC 12 champion) team will leapfrog TN. The same with an undefeated TCU (Big 12 champion).