I think he COULD impersonate anyone, but whatever "loophole" he used to get to Jacob, the tradeoff was that now he's stuck as Locke. Didn't whatshername from the 2nd plane essentially say as much?
In my mind, all the dead people we saw on the island, maybe including the one's Hurley saw off the island, were MIB. Locke is MIB. But Isabella then could not be.
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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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