Unless the person who came up with the list sees more staff turnover than just Denson, none of these guys fit the open position as RB Coach ( with the exception of Hart) unless they are willing to take a demotion from their existing roles/titles at their current schools. I betting the author just needs to fill content even if the content appears to make little sense.
What in the current role of rb coach at ND would make them interested in coming to ND? To get any of these guys (expect Hart), you would have to add duties that go beyond just RB coach and those would necessarily have to come from someone else's portfolio, most logically Long. Elston already has the Associate Head Coach title and Polian has the Recruiting Coordinator role.