I generally agree with this tier, though in a slightly different order.
While I would agree that Keatts' work at UNC-W has been impressive, I'm not convinced that his body of work merits such a big jump to a B1G job. As we debated with the A10, the CAA is definitely steps below and his time at Louisville as an asst was fairly brief.
I actually think Marshall may fall into the realistic category IF the money is there, probably close $5MM based on
his current contract and what he supposedly
turned down with Alabama. For one, with three straight MVC championships, I can't imagine he feels that challenged especially if it's felt that conference is waning or doesn't offer much of a ceiling. I think it's been since 2006 that the MVC has gotten more than one at-large bid. And this year, it could be zero if WSU wins the tourney or if the Shockers stumble in-conference.
However, at Illinois, he gets to challenge himself in the B1G on a much bigger stage with a bigger program budget (I assume) at a program that has proven in the past to have a high ceiling. Now, other factors could be at play that we don't know about, i.e., family firmly rooted in KS, waiting on an ACC blueblood opening like UNC or Duke.
With that in mind, my list would be Marshall, Cuonzo, Archie, Buzz, and Capel.