I have been listening to this guy a lot the past week. He is pretty entertaining and knowledgeable:
Curious if any of you listen to him?
I agree that in some ways OU and Texas are gaining more (or restoring more) rivalries in the SEC than they have in the current Big12. He talks about this at 3:00. I was looking at Oklahoma's main rivals (Nebraska, Missouri, Texas, and Oklahoma State per Wikipedia) and then Texas' rivals.
Texas restores Arkansas and Texas A&M, keeps Oklahoma, gains Missouri again, and potentially gets LSU as a rival. Seems like a win-win.
Arkansas, A&M, LSU, Missouri, etc. sound more intriguing than 90% of the teams currently on OU's schedule. I think Oklahoma State is really the only true loss (maybe TCU just because they built their program up to be a contender).