nice theory.stompg said:**********SPOILERS POSSIBLE*********************************
If they are already dead, how do 2 more people die? I guess the idea of purgatory is that you move on, not that you die again.
I personally like the idea of the island playing off your mind somehow. What you want (or don't want) to see will be there. Playing off both desire and fear. I would bet that the woman that believes her husband is still alive with the other people in the tail of the plane will probably run into her husband because that is what she wants.
For instance, everyone that went up to check for a signal with the transceiver wanted to hear a signal. Well, they heard a signal, just not one that they were expecting. Playing off both the desire and the fear of the group.
the purgatory thing may work like this: when someone is "admitted", they "die" from this world.