I think it's quite clear Denjiro is the strongest Samurai by far right now. I have him as at least King level if not stronger. Ashura was on that ship and he was shitting his pants like everyone else. Denjiro is SOLOING those ships.
This dude was gonna be Oden's First Mate and is the head of the Yakuza like Hyo. Kaido feared Hyo and Oden teaming up.