I will say that this was always the ONLY move I thought Texas and OU would ever make, if they made any move at all, and I always believed they'd do it together.
Moving west to the PAC never made any sense, their TV deals are even worse than the B12, the game start times make it difficult to capture audiences east of the Rockies, and the travel just gets too far-flung, especially for the olympic sports. Same thing for the ACC, aside from Clemson, the B12 is a better conference as far as football competition, and the B12 is better for money, so making that move never made any sense either.
The only potentially viable conference moves for Texas, were always the B1G or the SEC. And it always sounded like the B1G was pushing back on OU, and since I thought both schools would move together, then the SEC was the only realistic option.
But also, I always thought that Texas would simply follow the path of least resistance and stay in the B12. So I actually think OU might have forced Texas' hand a little bit on this.
Years from now it'll be interesting to read the articles about how it all went down behind the scenes.