So, do you have any theories about Charlie and Mr. Abaddon? My current thinking is that they are manifestation from the island itself...it wants to bring the Oceanic Six back to help it. (the island and I guess the rest of the people that didn't leave).
Thinking about this... I could go for that on the Charlie thing. I don't think the Abaddon guy could fit that mould. He was trying too hard to find out about what happened to the others on the island and if they were still there. If he was a manifestation of the island he wouldn't need that information as the island would already know. I think he is from whatever group killed all the Dharma folks and feeds Ben his information from outside the island.
Jackie