I don't see how guys like Chud, Hue, or Pagano are realistic. I don't see them leaving the pros for now.
And I have no idea which major conference coaches might be interested. I think you have to at least gauge interest from some guys no one would think are candidates--Dantonio, Narduzzi, Gundy, Richt, Mullen, Stoops, Patterson, etc.
That said, given whom I expect to be realistic, my top 5 would be:
1) Butch
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2) Herman
3) Strong
4) Fuente
5) Schiano
Nowhere on list: Cristobal