PAC teams like STANFORD, UCLA, and CAL have banded together in a pact to never ever allow a "religious" based school (like BYU, Tcu, or Baylor) into their conference. Those 3 schools are rock solid that no religious type school is going to gain admittance to their Conf under any circumstances.
You saw that last year with the UT, TTech, Baylor and A&M to the PAC, when Stanford, Ucla, Cal and Arizona violently objected to Baylor and the PAC was forced to immediately invite COLO instead in order to cut Baylor out of any further consideration. And it worked - Baylor was immediately dropped.
The PAC 12 is the only Conf in the country that requires a unanimous vote for inclusion into their league. Any ONE MEMBER can blackball a potential expansion candidate.
Re-alignment is frantic and undetermined at this confusing time however there is one thing that is absolutely 100% certain in all of this - TCU, BYU, and BAYLOR will never ever get an invitation from the PAC 12. Never !
Latest rumor that seems have truth to it - says TEXAS, OKLAHOMA, TEXAS TECH and OKIE ST to the PAC 16. And if TEXAS declines and wants to go independent then KANSAS gets the final spot.