Unlike Sanji Law Nami and every other Zoro subordinate, Zoro does owe Luffy shit.
In Romance dawn Luffy blackmailed Zoro into joining his crew at the promise that he will never hinder Zoros dream or else Zoro would kill him and Luffy agreed.
Since then TB happened and Hakai happened and ungrateful pathetic asshole Luffy still hasn't payed Zoro back.
In the polar contract to sanji Law and other Luffy minions who owe Luffy then life, Luffy owes his life to Zoro.
If Luffy has any moral integrity and isn't a pathetic douchebag, he should either kill himself or just let Zoro be the captain at worst and Zoro is smarter than him, stronger than him, kinder than him and has greatest moral compass in the crew.
In Romance dawn Luffy blackmailed Zoro into joining his crew at the promise that he will never hinder Zoros dream or else Zoro would kill him and Luffy agreed.
Since then TB happened and Hakai happened and ungrateful pathetic asshole Luffy still hasn't payed Zoro back.
In the polar contract to sanji Law and other Luffy minions who owe Luffy then life, Luffy owes his life to Zoro.
If Luffy has any moral integrity and isn't a pathetic douchebag, he should either kill himself or just let Zoro be the captain at worst and Zoro is smarter than him, stronger than him, kinder than him and has greatest moral compass in the crew.