Perhaps he doesn't need the body to simply impersonate someone, but needs the body to leave the island. Ilana implicated that by becoming Locke, MIB "trapped" himself, indicating that perhaps this incarnation is different than previous shapeshifting he's done.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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