User blog comment:Jaimini626/where is the crew/@comment-4493594-20120315083706

Depends on what Law is doing on the island in the first place.
 * 1) If he's there on the WG's orders he might have left his crew somewhere else to either keep them save or not to get in his way.
 * 2) The other possibility is that they are among the centaurs we saw earlier. I wouldn't be surprised if Law did such a thing to his own crew.
 * 3) Last and least likely: They are no longer his crew and left him when he became a Shichibukai.