The grand assumption here is KSU would be ISU's loss and only loss and KSU wins out. I think if you look at Colorado's schedule, KSU's schedule and ISU's schedule Colorado may have the easiest schedule of the 3 and more likely to run the table than KSU. ISU doesn't have a cupcake schedule either. What is interesting is if it were CU, ISU and BYU locked in there are easier tie breakers because more opponents in common

KSU ISU and BYU to me is a less likely tiebreaker than the other