I don’t think Utah beats USC if that is their third game and our first, so this is probably a non-issue. USC will probably blow through this schedule.
The real question is, if USC is 6-0 and Oregon is 5-1 or 4-2 do you risk a conf title game and losing a playoff seat or let USC play Cal or Stanford for their 7th game and go 7-0 guaranteeing you a playoff spot?