Yes but Troy didn't fall in the Iliad. It ended with Hector's death. So in the Iliad, though not the Trojan War, Odysseus need not have been there. Same with Helen and Paris - not that important in the Iliad, only in the backstroy. Really only Agamemnon is the only other absolutely crucial character in the Iliad since it was he who was the catalyst for Achilles' actions (or non-actions).
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