Importance of Faraday and Desmond

I'm not really sure why, but when Jack saw Desmond on flight 815 and said he looked "familiar", I'm not entirely convinced Desmond doesn't know everything that's going on. I think that he knows exactly who Jack and all the other original 815'ers are. I believe this for Faraday too. Again I have no evidence or real rationale as to why I think this, but for some reason I think they are working to correct things. Just my thoughts on the matter. Anyone have a comment?

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