From the Big 12's scheduling perspective, OU and Texas should leave in the summer of 2023 or the summer of 2025. OU and Texas leaving in the summer of 2024 would seem to be the worst choice. They have to create a 2023 schedule with 14 teams--including OU and Texas--in it. Then, in 2024, they have to flip the home-and-away status while eliminating all the games that would have featured the two departing teams to create a 12-team schedule. Certainly not impossible, but inconvenient.