We were young and thin in the secondary (top 4 corners were frosh and a sophomore). Michigan, for all their issues last year, still had a physical secondary that was capable of pressing Ohio State's receivers without getting quickly beat in coverage. And their front 4 was able to get pressure without a heavy mix of blitzes. We blitzed a lot, largely because we had to with all of the injuries on the D.L.
And a healthy offensive line really would've helped. We had 4 straight non-scoring possessions after our opening drive, while Ohio State scored 4 t.d.'s and a F.G. on theirs.