You may have allready noticed, but I'm just gonna through it out there:
Isn't it odd how Un-Locke tells Richard to tell the real Locke he has to die? Seems like he's only trying to get Locke out of the way.
Correct me if I'm wrong, but isn't the only other person who tells Locke he has to die Christian? Well if you were to assume that Un-Locke and Christian are both appiriations, and therefore one in the same (Smokey Monstermash anyone?) then this only gives me the impression that Locke didn't actually have to die, he was instead dooped by Esau into dying.
Just an observation.