I'm of the opinion that Jin's the last. I mean, the term oceanic six refers to people who were on the plane and were then rescued. Aaron wouldn't have been counted on the manifest, huh? He was in Claire's belly~ So maybe he's the +1 in the Oceanic Six + 1 (<-- LOST pop group  ) So yeah, 99.9% sure it's Jin.
As for the Date of Death on the gravestone:
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There are a number of reason I think that this doesn't make any sense. First, the date on the gravestone:
Also, in regards to Aaron:
Jam it back in, in the dark.