The MAC had a deal in place to add UMass for all sports, as well as James Madison U (who would be an excellent addition). UMass backed out, and JMU was left standing at the altar. I still think JMU has plans to get into the MAC, and they have even turned down an offer for FBS football from the Sun Belt because of how strongly they would rather be a part of the MAC (or C-USA, but that looks significantly less likely). Right now, they're searching for a partner to make the move with, to avoid the 13-team problem. One candidate I've heard as a potential addition is Missouri State, who is already a MAC affiliate in multiple sports.