BYU vs CU, BYU wins by virtue of KSU win and CU loss to KSU barring KSU plummeting in the standings.
BYU,ISU and CU same as above. If KSU finishes 4th or 5th in the conf they ll likely be the top team cimmon denominator. Unless they re in the the tie breaker, the win over KSU gives us most tie breakers against CU