Just one quick one I haven’t seen covered elsewhere.
If Sayid has “the sickness”, who else have we seen in a similar situation? Seemingly dead, but CPR’d by Jack back to life?
And it was after that is when we saw the really Dark Charlie, relapsing, killing Ethan, having strange dreams, attempting to “baptize” Aaron, etc. Charlie was infected, but he was cured at some point and overcame the “darkness”. Was it from being close to the Swan hatch implosion, or maybe building the church with Eko? Either way, there’s hope for Sayid yet.