Reincarnation plotlines for characters are always stupid. No need to make a character"the reincarnation of the ancient hero" or some bs. Just make them a hard worker.
Imo, Sanji's flames were literally just the result of hard training. Wouldn't be that weird by OP standards. Iirc, one of the Whitebeard commanders could light his sword on fire.
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Next major arc will probably be