I would accept it (albeit grudgingly) if they take Locke back to the island and he does a 'Christian', but I've always thought the island Christian isn't a straight up ghost of Christian Shepard, because I doubt he would act the way he is. I don't know, I always assumed it was like... an old spirit in Christian's body or something

(emphasis on the something

) And I think Locke is too nice and a tad too niave to become a Jacob type thing, although a lot can happen in three years
Good point that he might have had to move the island again. That would make sense, but I don't think he killed himself. Just the way Ben said, although he's a convincing liar

But know I know it's Locke in the coffin, I feel a little more annoyed towards Kate & co for not going

Shame on you
