I really didn't think TAMU would pull the trigger to the SEC. Reports suggest that the AD and many coaches didn't want the SEC (Given Bowtie's recent statements, Turgeon's departure makes much more sense), and there is a TAMU fanbase that didn't want the SEC. Yet, TAMU is going to the SEC, apparently driven by the other side of the fanbase and some key boosters.
I don't know if MU is leaving or not. I do know that they have a vocal fan base that wants out of the Big 12. The question is whether that fanbase is a majority, and whether key boosters support such a move.
Was the plan Rebecacy speaks of in place when MU's governor was pushing for MU to the Big Ten back in 2010? If he was part of the plan, then fine. If not, then I wouldn't be so confident that MU is just posturing. That same governor is still appointing people to the board of curators. It would be logical to assume he is appointing people with beliefs similar to his.