Having never seen UNI or Drake play, I can't comment on their players, but if I was drafting a team of ISU and Iowa Marble is the only Iowa player I would definitely draft in the top 5. Ejim, Marble, Kane, Hogue and then either White or Niang. Call me a homer
Not bad, but I would take White and Niang over Hogue. I would go Ejim, Kane, Marble, White, Niang and then it would get fuzzy. Hogue would probably be 6th but I haven't watch more than 1 game of Drake and UNI so I can't really say they don't have someone better. Hogue has been a beast but he would be the most offensively limited of the 6 you listed; his value (IMHO) is getting rebounds, playing tough D, and getting some put back and "garbage" points. This is HUGE when you have other offensive options (i.e. Kane, Niang, Thomas, Long) but if he was your #2 option, I am not sure he would be as good as the other 5.
I would take White over Niang as they stand right now, but also note that Niang is a soph and White is a jr. If I took into account how many years of eligibility they have left I would go Niang but I give White the edge straight up right now.