As for Desmond, I heard a theory (not my own, I wish I had thought of this) that his final purpose will be to drag MiB back into the Source, as this is probably the only way to kill him. Desmond is the only person that can do this (without dying, without becoming the new smoke monster), due to his resistance to electromagnetism. This is why he is the failsafe.
Failsafe if all the candidates die right? Since, I think Jack could now do it to and he can't be killed by MiB just as Jacob could not. If Ben kills them all (is this possible?) then Desmond would have to do it I guess!
Since Jack is like Jacob now and is indeed the island protector does he have the ability to "touch" someone like Jacob did ?
I would think so! And with MiB gone he could come and go as he pleases without worrying about the island (as much).
I don't think that Richard is dead. I think that if he were dead, they would have shown his dead body after Smokie grabbed him. I still think that an alive-Richard will play a part in the final episode.
I think that the reason Locke was able to walk after the original Oceanic 815 crash is because Jack fixed him in the alternative timeline. I don't know why or how fixed Locke's body ends up on the Island after the crash, but I think there's something to it. As I remember it, Locke seemed to have some sort of inherent knowledge about the Island just after the crash. He seemed to just know stuff that he shouldn't have known. Maybe this has something to do with it.
I agree about Richard.
Could it be that Locke was supposed to be "the one" but that changed when MiB intervened? Could explain that knowledge he had, which Jack later seemed to have when things fell apart with Locke.
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		