But that means, you'd better have a championship game for each conference. Don't forget, OSU didn't have to play Wisconsin last year. If the Big Ten had a Championship Game, they would have met.
Yes the Big Ten would need to add a team (say maybe ND). As I understand you have to have 12 teams to have a championship game for your conference.
Of course there are some who would say the Big Ten does have a conference championship game. It’s called the Ohio State-Michigan game. LOL!