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- His "doppelganger" was Ethan or another Other.
- This wouldn't explain why he looks like a duplicate of Dexter.
- His doppelganger is the smoke monster, like Yemi.
- Impossible, since we now know the Monster can only appear as dead people.
- His doppelganger is a hallucination, like Dave.
- His doppleganger is a future version of himself who survived the flaming arrow attack and returned to the beach during the brief flashes experianced when Locke, Faraday, Charlotte, Juliet, Jin and Sawyer were on their way to the Orchid.
- Went with Jack after the split because he trusts Kate.