Someone correct me if I’m wrong, but isn’t the first tiebreaker overall conference record, not just the record against teams in the PAC-12 South? Or am I wrong?
So overall conference record determines standing in the division. If two teams are tied, then the head-to-head result decides who plays in the championship game. If there are more than two teams tied, then they go down the list of elimination criteria to remove all but two teams, then use the head-to-head results.