No one wants to think about that.
But in that case, OSU would be in the CFP, Purdue would go to the Rose as the Big Ten champion (but not ranked high enough to get into the CFP), and Michigan ... don't know. Probably would not get ranked higher than Alabama/Tenn, so would not go to the Orange, but guessing they would be ranked higher than Penn St, so probably take the Cotton slot.
That pushes Penn St to the Citrus, but the Outback is still alive to take Illinois.
So that still leaves the Mayo, or even the MC if you're really crazy, to take the Gophers on paper, over Iowa and Maryland.