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?