I think the king is Aragorn. Frodo, however, does become something other than what he was which is why he departs Middle Earth with the Elves. That light that Sam sees around him while he sleeps is a harbinger of it. More than Sam and Gimli, or even Bilbo, who are allowed to go as well, Frodo is somehow transformed into one who belongs in a land of Elves and Wizards.
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Do justly, love mercy, walk humbly with your God. Micah 6:8
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