I think if you are Dixon, you look at the Big 12 and see Self at Kansas, Prohm at ISU, Kruger at OU, Beard at Tech, and maybe Weber at KSU. Then you look at the Pac 12 and the absolute dumpster fire that league is and the job that is open is the best one in the conference. So do you want to fight through 4-5 really good coaches at better basketball schools than TCU or go to UCLA in an awful Pac 12? Seems simple.
It should be waaaaaaaaaaaaay easier for a good coach to dominate the Pac at UCLA right now than to dominate the B12 at probably any school but KU.