Baylor is going to lose to OU in the Big 12 championship and will play in the Alamo.
Regardless of who wins that matchup the loser of the title game is probably going to San Antonio.
Best stage for ISU would be to sneak past UT for the Camping World Bowl vs a well regarded ND. With UT and either BU or OU available I don’t see the Alamo picking ISU for a second year in a row. These bowls rarely pick teams two years in a row if possible.