I think that just says that the Lakers seek out these people. Obviously, all but two were well-established at the time they went there (actually, really all but one). Malone was certainly trying to do a last-ditch effort to win the title that eluded him. Chamberlain was a bit different since the Lakers were seeking out a piece to go from championship contender to actual championship winner, since they hadn't won since Mikan left if I'm not mistaken (it's a shame they never won with Baylor).
Anyway, I'm not sure what it says that 4/5 were Lakers. It says something, but not really a lot.