User blog comment:Fgarchi/fujitora's presence/@comment-5962458-20131011172249

As it was stated in the Sabondy arc, an Admiral is sent to protect the CD from harm when needed. There was no indication that a specific Admiral has that job, so we have to assume that they send the one who is available at the time. As for Fujitora, his mission on the island is to investigate on the Law-Luffy alliance and act accordingly. That doesn't mean that he won't decide to arrest Luffy in the end, but he has first to gather all the facts, and that means talking to Law above all. That's why he didn't make a move on Luffy at the casino and he didn't reveal his identity either.