It really just comes down to:
1. Who would be an upgrade?
2. Would that person take the A&M job?
3. Is it worth a $90 Million buyout to make the change?
I think you'll find it's a pretty short list.
Kiffin or Heupel would both be an upgrade (as just about anyone would be). If both were offered something like 5-6 years / $60 million, one of them would for sure take it, and probably both would. Kiffin would almost by default, because even if OM could match the annual salary they could not come anywhere close to matching the duration due to MS contract law. The only way OM could compete on an offer is by going to something absurd like $15 million per year, and they aren’t doing that.
And if somehow neither took it, they could offer half that amount to some upstart mid major coach or someone like Kendall Briles and still have an upgrade. I see no way in any circumstance that Jimbo isn’t toast.