Plothole??? Walt/MIB

Ok so we know (or can most reasonably assume now that MIB is Chrisitan) what about when Locke (the REAL one) saw Walt when he was in the dharma grave? And what about Shannon when she saw Walt in the jungle? Was it MIB???? It would make sense, but walt wasn't dead fo rthe MIB to take his form. Will we ever see Walt again???? I want to say yes, but we only have 4 eps left (including the finale) and so much else needs to be answered as well. But to say he was MIB would it seem reasonable or would it seem like a plot hole b/c like I said it seems based on what we know so far that MIB can only take the form of a dead person.

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