The Mizzou reaction to all this just confirms what was already obvious: Missouri is a school/state with such a huge inferiority complex / general level of butthurt that they were willing to piss away any ability to compete for a conference title just so that they could stick out their tongue at Texas and KU and say "we matter!"
Now that the Big 12 is #conferencesexy (while SEC is still admittedly #conferencesupersexy), the only benefit they gained from their devil's bargain is pretty devalued. Brady Deaton better be polishing up his resume, because after 2 mediocre seasons in the SEC, Mizzou fans are going to direct their butthurt previously focused on Texas and KU at their administration for a move that was driven by those same fans.