I've been rewatching season two and Kelvin Inman tells desmond that he joined the Dharma Initiative, so I don't think he was an Other. I also think that there was someone in the Pearl station (someone who smoked because weren't there snuffed out cigs on the table) watching our losties. Also - when Kelvin was drunk and under the hatch where the fail safe key slot was, desmond asks him what it does and Kelvin says "electromagnatism. There was an incident, a leak, and now static electricity builds up and it has to be discharged every..." (not verbatim) My point is I had forgotten about this conversation, now maybe I think the purge and the incident are two separate things.

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