I don't think you can scale it like that. For example Zoro was able to tame the Kitetsu back in East Blue, which were swords known for cursing and killing all of its owners. And East Blue Zoro was complete fodder to anyone in the new world yet he still was able to fight with the sword. So unless you believe NOBODY in the history if Kitetsu users even as strong as East Blue Zoro, then obviously 'taming' a sword is more than strength
But for Enma we are given a pretty good run down of the history of the sword from when it was made to who was able to use it before and after so and Hitetsu even says Zoro has he potential to go beyond Oden and make it a black blade so as it stands, Zoro is looking to be quite above the Scabbards
Though granted, they’ve gotten stronger but the context clues of the story indicate that Inuarashi and company aren’t as strong as Oden even now
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We have Kinemon clearly stating that he would refuse the sword if it was given to him.
No Zoro is not above the likes of Shutenmaru and the dukes.
No Zoro is not above the likes of Shutenmaru and the dukes.
And even Hitetsu saying Zoro can turn the sword black?
What are all these guys gassing Zoro if he’s about as as strong as these other guys who are right there? In fact Kawamatsu is a literal peer of these guys