Kaido's black lightning is busho no Haki level 2 or not, this is the explanation

 The discussion about the theories of one piece has never been exhausted to be discussed in order to uncover interesting new things and also the creator of one piece, echiiro oda, who always gives puzzles in this one piece manga

 Now the most frequently discussed theory is about Haki, the discussion about haki began to be discussed frequently after the appearance of katakuri characters in the whole cake arc, this is natural because katakuri appears with a large fact about haki, which turns out that if haki is trained, haki will enter advanced level

  The emergence of katakuri with its ability to see the future thanks to the observation stage (kenbunshoku no haki) is quite surprising, but because of that the advanced theories of haki begin to emerge and on this occasion only discuss the form of advanced busho no haki (haki defense) black lightning attack or invisible attack

  We discussed earlier the emergence of advanced busho theory, when Kaidou defeated Luffy Gear 4 mode very easily, as shown below

 Many think that when the kaido hits Luffy with a hammer, many assume that Kaido's hammer hammer is coated with haki, because at that time Luffy was in Gear 4 mode, so Kaido must have coated his hammer with a busho haki to compensate Luffy's Gear 4, then when Kaido defeated Luffy with a punch from his hammer punch, there appeared a kind of black lightning around Kaido and Luffy

  From the appearance of the black lightning, many argue that the black lightning is an advanced level, because if we remember Luffy was a rubber man, so any electric attack would not have a big impact on Luffy, from here came the theory that the kaido's black lightning was busho advanced level, this is based on the fact that Luffy is a rubber man, but can lose so easily with Kaido's black lightning, so it's likely that Kaido's black lightning contains busho haki, which makes him able to defeat Luffy so easily

  This theory makes more sense, because we know that kaido eats zoan dragon type demon fruit, then we all know that the ability of the zoan-type demon fruit focuses more on the body's strength of use, so where is the power of kaido's black lightning

  If you still think that Kaido's black lightning comes from a demon fruit, the chances are very small, as I explained above

  So the theory of black lightning belonging to the kaido is that busho advanced levels may be true, but even so I do not believe in this theory, because I discovered a mistake from this theory, and that mistake could make this theory indisputable, along with mistakes that make the theory of lightning black is an advanced form of busho haki can be refuted

 I think the theory of black lightning is an advanced level, it's just a normal thing that is big, because in my opinion Kaido's black lightning is just the effect of 2 busho hats dueling, if you still don't understand

  Try to remember that in the arc dressrosa, when doflamingo will step on the law with his feet, after that Luffy holds doflamingo's legs, then Luffy's legs and doflamingo's legs hit each other with their feet covered with busho haki, then around Luffy and doflamingo appear black lightning around them

 So in my opinion, Kaido's black lightning is only the effect of two busho huts dueling each other, this is reinforced with Luffy who is in Gear 4 mode, because Luffy's body condition was coated with busho hats and also the possibility of Kaido's weapons being lined up busho haki, maybe that is how kaido's black lightning appeared

Conclusionn

For now, in my opinion, Kaido's black lightning is not an advanced level, but only the effect of 2 busho hats dueling, then in my opinion the theory of kaido's black lightning is just a hot ball that oda gives to the otaku, and also I can hide important things very much like the theory of black lightning, which might appear because of the name of the kaido technique when hitting luffy