As Season 5 is centered about the Island's moves in time, and the possibility of stopping it, I'm more and more convinced that Adam and Eve are actually two characters we know/are about to meet in Season 5, posibbly those characters are going to die in the past and stop moving with the Island and are left in the Caves, becoming the Adam and Eve we get to know in Season 1. Other possiblity is that the Island stops moving and the Losties are left in the Island's past and die of natural causes (or the Sickness?), while residing at the Caves.

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