San Diego state I have a hard time ranking. They are 6-0. Their best win is over Utah (4-2) who is now the top in the Pac-12 South. Outside of that, they haven't played anyone. Next week they play Air Force (6-1). A win there would push them up in my rankings. 
San Diego State has a pretty solid win, at home against Utah in OT, but they don't have anything else that's remotely close. It's not enough for them to sneak any higher in the rankings.
Here we get to the rest of the undefeated teams...Utah upset ASU this week giving SDSU a nudge over SMU other than that not much to report for these teams.Last Week: 17
SDSU escaped an upset against a San Jose State team that had been underwhelming after last season.  The offense was stagnant and anemic and they could have a QB problem brewing.