MJ (how the heck do i get clutch?! lol, and become a great leader and winner?)
Magic (improve my handle as a big guard, and improve my already superior court vision?)
GP, which he already has (i'm awesome at blocking shots and getting steals, but how do i play defense?)
Steve Nash (how do i become a half court offensive master-mind?)
Big O & JKidd, & Magic again (how do i get so many triple doubles?)
Kobe (how do i build an intense will and work ethic, and media backing? lol)
I'm sure there's more greats he could reach out to. And it's not like it's not possible, I'm sure his agents can track these greats down. Even conversations alone could help, i'm sure he'd have to get lucky to actually get on court lessons from them. Plus Wall's got rep. as an up and coming superstar in the league, i don't think these greats would turn him down for some advice.
BTW there's a poll, hope it gets some traction, lol.