BYU won't get it from the PAC as they are staunchly secular... if they wanted BYU, they would have added them decades ago. Baylor and TCU are also unlikely options because of this.
I think Texas ends up in our conference. Delany obviously wants to eventually expand based on the way he agreed to the tv contracts, and Texas would likely prefer to be associated with more eastern-based flagships and potentially restart their sports rivalry with Nebraska. Not to mention they follow the money.
It really could potentially end up with the UT (along with OU) going to the B1G, TT & UH going to the PAC.
Good luck getting enough votes from B1G members for Texas.