The IVY League is participating and gets an Auto bid, but the MEAC does not. There are eleven conferences with auto bids and two of those do not have a top 25 ranked school. That would indicate that number 23, 24 and 25 would get left out of the playoffs, but with multiple rankings to evaluate it is still a guess if your school isn't in the top 20 which puts the SLC as a potential snub for a third bid.