These prediction models work better at the upper level of FBS where strong programs will almost always be good and weak programs will usually be bad. They are less reliable at the FCS level where the addition or subtraction of even one elite player can change the fortunes of a team dramatically. The best example of this is Illinois State. In 2013, they were the poster boy for mediocrity, winning all their home games while losing all their road games. Enter the quarterback transfer from Indiana, a player that nobody at the FCS level could contain in the open field, and Illinois State became an instant title contender. Should that stud be seriously injured now during his senior year, Illinois State would instantly revert back to mediocrity.
Needless to say, coaching changes can also shatter these prediction models. For better or worse, YSU will be a vastly different team under Pelini.