I'm guessing the four schools jump by Friday.
If I am CU, I am on the phone now saying we are in and want to announce asap. Take it while it is there and push the two PacNW schools into the very poor position of being stuck or getting on board. Play the hand from strength while you have it and Jump. Get at least 1 partner school that the Big 12 wants and get it done. Wait until OR and WA decide and then all of the leverage is gone