How much credit do NBA big-man gurus deserve?

for the past half decade, wings and bigs alike seek out legendary centers in the offseason or at time an organization brings one in to work with player or group of players.Hakeem is the biggest profile coach among these

Notable players:
LeBron
Kobe
Howard
Amar'e
Tyson Chandler
Carmelo
JaVale McGee
Yao

Kareem has a much smaller sample size but his guys include:
Bynum
Howard
Noah
DeAndre Jordan
Blake

Guys like McHale,Cartwright Ewing and Kiki have either coached or been in the front office.
Have you seen a noticable difference in these guys?
Obviously LeBron is killing it in the post nowadays-but he and Kobe are all time greats. With Bynum (previously) I think you saw long term benefits of Kareem,especially last year. Noah seems to be a better player-but is reaching his prime right now anyway( coincidentally shooting a much lower hook shot %).

Point being, is the perception greater than reality with the big-man guru? Are the best players simply going to be better or will we ever see a case of taking an underachieving player with massive potential and that player becomes transformed into an All-NBAer after working with a guru?

Who else would you like to see be a big man coach?
I've heard Shaq speak of a "big man camp", has that actually happened?