This isn't whom you want to hire, it's whom you think Joe C is going to hire. Poll will be up shortly; I'll try to include all of the most likely options.
I'm going to say Gregg Marshall. He just seems like Joe C's idea of an ideal "backup plan" kind of guy after the first tier guys have spurned us, which by all indications is what's happening right now.
As far as my personal opinion goes, Gregg Marshall would be a prototypical "meh" hire. I don't think he'd completely fail, but I have my doubts that he'd ever be able to accomplish anything great here.