ISU still has:
Texas Tech (5-2)
Kansas (2-5)
Cincinnati (5-2)
Utah (4-3)
Kansas State (6-1)
BYU still has:
UCF (3-4)
Utah (4-3)
Kansas (2-5)
Arizona State (5-2)
Houston (2-5)
Then there's the Big 12 championship game.
BYU has a chance to sweep the rest, but ISU is going to have a much tougher time, especially against KSU and Cincy (lost both games by 3 points or less). I don't see ISU pulling it off, especially since they needed a lot of help from Lady Luck to beat UCF.