It was a case of “hey, look, this isn’t working out, maybe you should start interviewing for some other jobs.”
Like Jonathon Gannon and the Eagles/Cardinals. The Eagles lost, Gannon thought he was headed back to Philly and Philly told him to stay in Arizona and interview for the Cardinals job.
The B1G didn’t want USC or UCLA and once they were added, the commissioner kept pushing for further expansion and then they parted ways. It was no secret the schools didn’t like him.
If the B1G wanted to expand, they’d still have Warren as their commissioner and the P10 wouldn’t exist anymore.