I'd always thought it was Merry. Borrowing from the quote above:
Quote:
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No other blade, not though mightier hands had wielded it, would have dealt that foe a wound so bitter, cleaving the undead flesh, breaking the spell that knit his unseen sinews to his will
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So it seems that only the blade that Merry bore was capable of actually destroying the Witch-King's "body", or Life Force if you like. Technically, the Nazgul was already dead when Eowyn dealt her stroke, and it still broke her weapon, anyway.
And as for the Prophesy; well, Merry is a Hobbit, not a man, thank you very much.
All hail Meriadoc, Slayer of the Nazgul!