First Nefertari Buggy now this. Dawn & Dusk needs to stop stealing my theories. Just kidding, keep going until you make the Shanks Underworld Boss video.
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this actually let me finish the idea. i think i get it now.
Ryuma forged his black blade when he died. His own soul left his body and is in the sword Shusui.
Mihawk is some kind of soulless walking corpse. He forged Yoru with his own soul but remains as a body animated by the soul of his blade until he's defeated. This is why Zoro said the Seraphim was "more human" than Mihawk.
Zoro will forge his black blade after he dies and meets Kuina on the Sanzu river in Yomi no Kuni. Kuina and him will cry together and decide that Zoro can't die until he accomplishes his goal. Kuina will thank him for carrying her will so far and then HER soul will physically join with Wado Ichimonji, turning it into a black blade, so Zoro can leave the underworld alive.
