During the last expansion phase, the Gaytors, *****, Bulldogs, and Wildcats formed a 4-school veto to prevent the SEC from offering UM, F$U, Clemson, GaTech, and/or Louisville.
I believe that the SEC's wet-dream for School 15 and School 16 would be 2 out of the 3 of North Carolina, UVa, and Oklahoma, in that order.
UNC and UVa puts the Confederacy back together again (and don't forget, Kentucky and Missouri were the 12th and 13th stars on the Confederate flag and Confederate battle flag for a reason).