IMHO,
Oregon - Rest of the world figured it out. Sports, particularly college football, works like that. A team rises above its historic average for a while, sometime as much as a decade, but the traditional powers eventually rise back. It is why they are traditional powers. In this case, everybody else informed Nike that it had to play things more even and the California schools that Oregon raided for recruits stepped up.
Northern Illinois - This is how the lowly MAC works. You over-load one or two classes and try to have a great year or two (and get a better job) and then everybody graduates and you take you beat downs. Life in the lowly MAC. Some dumba** posts "hey, X-team from the MAC is ranked, blah, blah, blah." Yeah, and the next year it wins 2 games and some other team of future phys ed teachers of the midwest has a good year.
Michigan State - Five of its losses have been close, but close only counts in horseshoes, hand gernades and atomic warfare. Hard to say. Probably feeling the pinch of Michigan getting back to normal after its two previous coaching disasters, no longer able to get kids to pick it over Michigan.
Marshall - QB is not a I-A level QB. OC is not qualifed to be an OC. Hope to see the last of both a week from Saturday.