^This could be Blackbeard D. Kuma's fated/desired Moria v. Luffy Part II: The Reckoning.
That being said, Luffy has several individuals he "owes" a second fight to: the Pacifista, Sentomaru, Smoker, even technically Aokiji. Luffy doesn't really care about Kuma, and, realistically, Zoro "owes" Kuma far more than Luffy does.
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