Off the top of my head:
Because the Big XII doesn't have any notable big wins from the OOC part of the schedule.
Because the top team in the south (OU) lost to Colorado, who lost badly to ASU, KSU and today lost to ISU.
Because the top team in the north (ku), while undefeated, has a horrible SOS and hasn't beaten anyone ranked.
Because the .500 teams in the conference have lost some real jaw droppers... I don't want to talk about this one... lol
Maybe bowl season will prove me wrong. Doubt it tho.