Zoro is not the king of hell, it's just a figure of speech, it's more of a state than anything, no one remotely reliable consider it as an epithet, this shit is also zoro downplay in disguise:endthis:
Again king referred to zoro as king or a person wanting to be king like kaido it literally makes perfect senses why sanji was dubbed wings. Since he operates as the wings that carry the two kings
 
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