The date on the tombstone is confusing, but I got the impression that Sun and Hurley really believe Jin to be dead. I think this because they actually went to the grave site. If he was still on the island or somewhere else and Sun knew this would she still have gone to the gravesite. Seems like if she knew he wasn't really dead she would only goto the grave to put on a show for somebody. But it was just Hurley there. Was she putting on a show for him? If so that could mean that Jin's part wasn't a flashback and he is off the island but back working for Paik?

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Doctor playing golf. Woo, boy howdy, now I've heard everything. What's next, cop eating a donut?