Every year they not play 2 teams from the South Division...rotates equally...so this year it is USC and Colorado...last year it was UCLA and Arizona....5 North Division Games; 4 South Division Games and 3 out of conference games. In none of the Power 5 Conferences does every team play each other(except Big 12 which only has 10 teams which was the same when the Pac-12 was the Pac-10). They could still play USC if both teams which their respective division titles! :-)