So, reading that right, really all that needs to happen is:
This weekend:
Beat Baylor but not win by more than 20
ISU has to beat OU
Final Week:
Beat Texas
Baylor has to beat Tech
ISU has to lose to TCU
Okie State has to beat OU
So not impossible but pretty unlikely, the ISU part is the more unbelievable thing out of the whole deal. Everything else looks "doable" in the sense it wouldn't be that crazy, but ISU having to win @OU and then losing to TCU seems like a stretch.