Oklahoma and Texas are, without a doubt, the two most esteemed programs to ever play in the Big 12 conference. Combined, the two schools have won 11 of the 19 possible Big 12 Championships, are the only Big 12 schools that can claim a national title since 1950, and have historically dominated the recruiting pool of Texas and the Midwest. If the thinking is that they have nothing left to prove in the Big 12, they certainly have a valid argument.
Recent news revealed that Oklahoma and Texas have inquired about joining the SEC as members, following suit after what Texas A&M and Missouri did in 2012.