We've all seen talented teams in the past that for some reason were inconsistent, even quarter to quarter. They would light some opponent up and then suddenly look hapless with the same personnel. I don't know if Um qualifies, or why some teams are like this.
A team like Alabama seems consistently to just grind nearly everyone to death in a game. Clemson can be a bit up and down. Ohio State this season looks like a team that has always been good, maybe they have had a bad quarter against MSU. With Michigan, perhaps we don't know which team will show up, and if the good Michigan happens with OSU it would be a game I think. If the bad version shows up, OSU will blow them out.