this isnt Dennis Schroeder level mystery, Exum has been a known commodity for a pretty long shelf life considering his age/location. even though Dante is 2 years younger, gauging his progress next to the timeline of a player like GR III can help illustrate the size of his body of work
Glenn Robinson III was the big late rising HS player in the 2012 class, he wasent a 5 star recruit until late in the process (looking now at his sagging %'s it seems like that was his peak).
Exum in 2011 (at 15) was invited to be a member of the senior National Team, received his AIS Scholarship, and was a feature story in Australian news.
so yeah i guess during the time when GR III went from a 4 star to 5 star recruit to a top-10 guy to a lottery guy to a fringe 1st rounder, Exum's been consistently building momentum... i dont see how you can fault him, or grade him any less than cant miss...
its not like hes avoiding camps/events...it should be noted hes participated in everything you could ask of an international prospect(Addidas Eurocamps, Hoops Summit, Addidas Nations, U-17 and U-19 World Championships etc.)