i think Jin made the choice to stay because of his life back home. he didn't seem very happy and it showed through the way he treated Sun before the crash. the island has changed him so why go back. Sun needs to go back to save her life as well as the pregnancy.

Sawyer was talking to Kate before she re-joined Jack and he said that he had nothing to go back for.it seems that most of them don't want to leave for that same reason.

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