If Kelvin was recruited by Dharma after the Gulf war, wouldn't he have to be in the Swan at the time of the Purge? If we put him there in 1991 or 92. The purge would have been after that. It looks to me that Ben aged much more than 12 years btween the Purge and the present time.
Also, why didn't the hostiles attack the stations? We now for sure that the didn't attack the Swan because Kelvin was still there to find Desmond. Unless Dharma was still sending people to the Swan after the Purge because of its incredible importance in saving the world and keeping the island hidden. I suppose this could be a possibility but I dont recall off hand the dates that Kelvin said he was there.

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