So, a few things here. I'm surprised that Ohio State is ranked as highly as it is by Massey. A weird quirk given that their best win is over Kent State (?). It is interesting that Massey indicates that the Pac-12 has 5 of the top 10 defensive teams in the nation. Stanford, Oregon, Arizona State, Arizona, and UCLA are all in the top 10, with Washington State and Washington not far behind in the Top 21.
The other quirk? Princeton is rated as having the 19th toughest schedule, despite not having played a game this year and having their season cancelled.