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The gap between swords is overrated as long as all are Meito.
Like the manga never portrayed a single grade difference as a big deal, just like rendering a blade black which funnily makes it jump grade, or at least Enma according ti Hitetsu, does.
Like the manga never portrayed a single grade difference as a big deal, just like rendering a blade black which funnily makes it jump grade, or at least Enma according ti Hitetsu, does.
Also, blades are ranked before turning black. Once they are black they are just better but remain the same rank. We don't have rank above Supreme Blade. If that blade from WB which is a Supreme Blade turn into black blade it would remain a supreme blade. Just like Mihawk's blade was already Supreme before turning black and Shusui was already a Great Grade so as Enma.