Florida had one of (if not the toughest) schedule last year, and again this year.... That is pretty tough on a school.
Last year Michigan had a pretty easy schedule for the first half of the year or more.... this year is tougher. But Ohio State has the relatively easy schedule this year.
Getting into the Playoff is going to be about 9-3 vs 10-2 teams, and the different strengths of schedules are going to be a huge part of that decision process.