Not really, otherwise she would have exploited him. She was will to go down in order that no one saw him. My guess is, she doesn't want anyone to realise he's not hers. Which just adds to the whole feeling of either something happened before they got off the island and the oceanic 6 are the only survivors. Or, and more likely (as Jack wants to return to the island at a later date) they are hidng the fact that people are still alive on the island as they want to stay on it and be left alone/have done something which has angered 'an organisation' which would kill them all if they knew there were survivors. This would be the organisation the Black Man belongs to and the quite probably the 'list' people which Saiyid and Ben are killing off "in order to protect [sayid's] friends". Also, notice how the people Sayid is killing on "on a list"? Like "the list" which the others had when they captured Hurley, Jack, Sawyer and Kate at the end of series 2, and they let Hurley go, as he wasn't on their "list". Not sure of significance, but knowing Lost, there's probably something obscure there. then again, these are prbably incoherent ramblings. I need to go to bed :/