Haha I know!!! Ok finally we can talk theory. I think Locke has been possessed by he other guy Jacob was talking to in the beginning. Remember when "Locke" told Richard to tell Locke that he has to get everyone to come back to the island and he would have to die? If Locke is possessed by the other guy he was basically telling the real Locke to die.
Also when Ben went down into the Temple to be 'tested', the smoke monster(I think the other guy is the smoke monster or controls it) turned into Alex so Ben would follow Locke. When Ben started following Locke, he was actually following the other guy, just in Locke's body.
That probably made little sense. But this finale was f**king AWESOME.