I don't think it's a direct power up in the sense that having a black blade made the user sword superior to one blade that isn't black. Otherwise the battle against Vista would be different. At a minimum the blade would be a actual concern during the battle.
The thing that I think is more plausible based on the hints is that a permanent black blade don't need a continuous infusion of Haki (CoA) to block or attack another haki user, making the user less tired and any use of Haki beyond the base a plus. A user without a black blade would end up wasting more energy to get the same base results as someone with a BB. In this sense a user of Black blade would have a advantage (specially in long battles) that would tip the scales in his favor, but this advantage is not a direct power up that increase AP or defense, beyond the usual levels of the user.
The thing that I think is more plausible based on the hints is that a permanent black blade don't need a continuous infusion of Haki (CoA) to block or attack another haki user, making the user less tired and any use of Haki beyond the base a plus. A user without a black blade would end up wasting more energy to get the same base results as someone with a BB. In this sense a user of Black blade would have a advantage (specially in long battles) that would tip the scales in his favor, but this advantage is not a direct power up that increase AP or defense, beyond the usual levels of the user.
you remember that right?
the part where they talk about the sword increasing in quality
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Black blade is CoA-related. Oden was probably more balanced in CoC and CoA attributes. Black blade is more of a narrative driven thing than power thing anyways.
Hmm but Ryuma has a black blade and Ryuma is talked about like he’s stronger than Oden… you don’t think Ryuma having a black blade counts as one of the reasons he’s stronger than Oden
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You want to know why he didn't turn his blade black. I asked how does one do that?
mihawk talks about black blades during the scene where he’s teaching Zoro CoA coating… he says Zoro needs to CoA coat his blades
so what we know is that it’s from CoA and “Countless battles”
Also Oden’s father said “Enma was yet to become a black blade”… So Oden’s father at least believed Enma was on its way to becoming a black blade… Meaning Oden was in fact doing something that made a black blade… and simply failed to accomplish it before his death… this is Oden’s after, the master blacksmith that’s saying this
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