Scenario as there is
ISU loses one(not KSU which is a home game), BYU loses one, and CU wins out. This is a likely scenario and as likely as any to get to a 3 way
ISU and BYU are in and it doesnt matter who either lose to by virtue of beating KSU and Colorado losing to them.
Now if you re talking about a 4 way tie, thats a different story. But most likely 3 way BYU still in