that they were vulnerable enough to leave all sports on the table provided byu join and help stabilize the shaky league. It when the big 12 picked up TCU/WVU and did that whole grant of rights thing I think they regained leverage which could have removed the no Sunday play from the negotiating table.
That said, it’s also possible football only was always the only option. Either way, those denying that serious discussions were being had are in denial.