There are only 3 teams in the AP Top 25 from non-P5 conferences and 4 in the Coach's poll.
Sagarin and Massey ratings know better, since the their numbers actually keep track of what's going on instead of depending on the moderate-to-shallow cogitations of coaches and writers, some of whom at least do not pay attention to what's going, as with the early votes for bad-from-the-start PSU and the current love given to Georgia with its #92 SOS schedule and 16-3 record.
Sagarin has 5 teams and Massey 6 in the top 25 that are from the D&P28, including UConn, Princeton, Green Bay, South Florida, George Washington, and Western KY.