Oda didn't wait long for us to know Mihawk and Ryuma's swords are black blades. Clearly he wants his readers to know when characters have black blades. Why all of a sudden change it? Nobody can provide me with a logical explanation why we're having to now wait over 100 chapters. It's because it's not a black blade.
We did plenty of times. As said a thousand times:
1) Black blades are called as such
only after they are used, not before, so still trying to sell that "no, don't stop at something that looks exactly like a BB with no hint to be anything different", not only is it baseless, but it's even disproven.
This type of argument may have some space when Aramaki uses his blade, and nothing is said about it.
2) As said thousands of times in these 4 years, Aramaki is based on someone, called btw Aramaki too even, who basically kept his sword skills secret. That's why, for the 10.001 time, for Aramaki Oda went for the speculation route and didn't outright have him use the blade.
Now going by manga facts is cope?
Yeah, trying to say we shouldn't use our eyes and call a black blade... a black blade because a completely unrelated character made a copy of a super normal, standard white blade is cope.
By this standard, what proof do we have that Shanks' sword isn't in fact only a very convincing replica, just a cracker's lol? or Imu just the same?
BTW, anyway, no: Oda did draw Cracker's
armour with a fake sword, but only because Cracker, in his true body,
had the original sword in his possession.
Craker had the real Pretzel, which he used on screen.
You want to theorise the same for Aramaki, even though there are no hints? Cool, then what we saw was a replica and Aramaki still possesses the real, totally equivalent Black blade.