There is no such rule that all swords will upgrade by level. Enma may upgrade but same can't 3said for other swords. You know bisento also one of the supreme grade weapon, doesn't that make bisento same as yoru. But here we have yoru to be strongest weapon. So there are differences even when...
Or simply yoru is a supreme grade sword to begin with and became strongest after becoming the black blade. You can have the same grade even if one weapon is superior to another.
Debunked.
1656655221
No it wont work that way. You can have best output only by mastering it, similar to swords. Only difference is other abilities of DFs are passive. Luffy didn't have G2 or G3 or G4 or G5 as soon as he got gomu, but he had rubber property as soon as he got DF.
Also, Yoru is...
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