Why would the Pac-12 have interdivisonal games the last week of the season?
So if Stanford beats UCLA this week, they play again the following week @Stanford? Did anyone in the PAC12 office not think that having the team that won the South last year finish the season against a team from the North that went to a BCS Bowl last year was a horrible idea.
Pac-12 scheduling is too complicated to consider these scenarios. Aside from the nine-game conference schedule, Cal, Stanford, UCLA, and USC insist on playing each other every year instead of being part of the rotation to not play two interdivision teams each year.
As for Cal and Stanford not playing at the end of the year, every few years one of the end-of-year rivalry dates has to be sacrificed for several reasons, including the fact that Stanford and USC alternate playing their last game against Notre Dame. Here's the complicated explanation: Wilner explains the schedule