By my best assessment, using the site below, here are the clinching scenarios.

https://bball.notnothing.net/big12.php?sport=fb

BYU clinches this week if one of these plays out

• BYU win and Colorado loss
• BYU win and ISU loss

If BYU wins this week and doesn't clinch this week with one of those scenarios, they clinch next week with:

• BYU win
• BYU loss,andColorado loss to OSU
• BYU loss and ISU loss to KSU
  
  
  
  

I didn't run a scenario where we lose this week and get it..suffice it say, Colorado, isu, and asu would probably have to lose everything else