Each team playing nine games in one day would leave most teams pretty thin, I think.
I think that BYU, Coastal Carolina, and Cincinnati would be the bottom three.
I have a different question bouncing around in my head: what separates a 6-0 Ohio State from a 6-0 USC? Everybody'd got tOSU penciled in as the #4 CFP team, barring strange goings-on in the SEC, but nobody's got USC even under consideration.