So... Who's Not Really Dead????

Now that we know The Others & Dharma & Hanso & Mittelos & Widmore & all can fake death (with the venom of the Medusa spider) who is not really dead?

I'm thinking Jack's Dad (who will undoubtedly turn out to be a major figure in this conspiracy) Ethan, Libby (who could have been shot with a blank, or holding a bullet-proof pillow).

Remember, we have seen signs of an almost omnipotent ability to manipulate people's lives, even before they were on the island. I submit that everyone on Flight 815 was manipulated into getting on that plane (or however they got there, i.e. Desmond).

We know that some people were coerced into playing their part (like the psychic doing the about-face on Claire). Some people have been intimidated (Juliet). Some more subtly manipulated (perhaps Jack, if his father's death was staged with Medusa venom).

Also, we suspect these forces have some ability to control people's thoughts (like giving Locke, who is easily influenced, "visions"). They also may have the ability to travel in time, as well as rapidly travel in space (Desmond's return to "pre-island" London).

Now, on top of all that, we know they can make someone seem to be dead when they are not. Pretty powerful tools if you want to control other people.