Does anyone know who jacob actually is lets hazard a guess at who he is

Is he one of the losties past or future self "Unlikely"

Is he Richards father "possibly"

Is he the spanish man jack was working on "Unlikely"

Is he the man that was lying next to michael in hospital "Unlikely"

Is he a human four toed guy "Possible"

Is he the captain of the black rock "Unlikely because he was looking out at the black rock in the finale"

My favourite theory is that he is richards father how else would richard know so much about him and why would he give him the key to eternal youth

Why does jacob use a surrogate it seems a bit pointless i mean he could speak for himself although it does make for better mystery please tell me what u think

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