Something that not many here are discussing is will the committee's decision influence the way the B1G chooses it's champion? If the committee takes OSU and leaves out a 2 loss champ, the B1G may consider changing their rankings to include total record instead of just conference record to ensure that the conference champ isn't left out in future years.
I think that would eliminate all quality OOC opponents in the future.
The answer is an expanded playoff. Conference champions must be in the picture. It's the only way to solve the "best" vs "most-deserving" riddle. As potentially painful as this will be for someone (likely us), it's this kind of pressure and pain that brings about meaningful change. If the committee finds themselves in an extremely uncomfortable position and enough controversy ensues it will be a good thing.