who would we be most shocked by? Walt, Hurley, maybe Jack, Claire, Rose and Sun. Anyone else?
Are Rose and Bernard part of this "conspiracy"?
Walt is found, but has been changed by the Others?
Hurley loses it (I don't think the writers would take the cheesy, easy way with mental illness)?
Jack tries to save people's lives, Claire and Sun are just too nice; they are unlikely, so one of them would be a surprise.
There is always the possiblity that it is not Shannon. There is speculation about Sun leaving the show, but according to Kristen, whatever it is, it isn't suicide.