No Ohio State didnt win the Big 10 because Michigan lost to Iowa. Had UM beat Iowa, it would've been OSU in the Big 10 championship. Their resume shouldn't be damaged enough to miss the playoffs because Michigan can't take care of business. They have 3 wins against teams currently ranked in the top 10 (no one else can make that argument) and 2 are on the road. If you leave them out because of a fluke loss by their arch-rival, what kind of playoff system do you really have?