You should check some of the Iowa recruiting threads on this site, their '20 class got ripped by everyone on here, Nunn may rise in the rankings but as of now, he's comparable to those recruits, he'd actually be on the lower end. We'd be making fun of him if Fran signed him and he's got a much better track record of molding low rated recruits into p6 players than Prohm.
I think the kid looks solid but the people in this thread saying this is the type of recruit Prohm needs must never have seen his teams play. He needs studs, not development guys. Nothing he's done here points to him being the type of coach that is going to bring lower rated recruits along, he hasn't figured out how to play to a kids strengths if they don't fit in to his system, so he just continually turns the roster over until he can find the right guys. Under Prohm it's been if you don't play as a frosh, you transfer. We haven't seen one single player sneak in to the rotation as an upperclassmen after riding the bench as a frosh at it's year 6.