I personally think that Jin is still on the island, why he didn't stay with Sun I'm not sure, maybe there wasn't room or time?? Jin's tombstone says the date of the crash so goes along with teh story that everyone died, except for 8. The dates of Suns pregnancy are something that they will have to deal with, she got pregnant on day 49(ish) but we don't yet know when they actually leave. Maybe when they leave the powers that be provided a doctor so no one needed to see how far she was in the real world?? Perhaps when she phoned in labour this was the first time she'd gone to an off island doctor, so if she's in labour I don't think they'd bother to scan to see how far she was.
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