When you give up 39 points you aren't really that impressive. It was a great game to watch. Maybe if they were in Ann Arbor in front of 114,000 screaming UoM fans the outcome would have been different.
I think they can be beat by USC, Michigan , or ND if the stars are aligned. Doesn't mean they will be.
The problem is if they (OSU) face somebody other than Michigan and stomp them, then all the sports geniuses will say it should have been Michigan again. It has the potential to be a damned if you do, damned if you don't choice.