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It was just put there to make the ending open to interpretation.
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I don't think bungie was going for 'requiem' or anything specific. For a while I thought it looked vaguely like sangheilios, but it is irrelevant.
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Seems a little too big plus there is no pattern on the Traveler like there is on the Legendary Planet.
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It would not matter because it is a different story from a different narrative. Both are unique unto themselves.