it’s all too confusing to me tbh, cause Nika learned ryou prior the rooftop and was clearly touching Kaido when he used COA but was hurting Kaido, no touching only happened after he used COC
The bottom left is what he used against Kaido, red roc. He hasnt been using it against Kizaru as far a I can tell but then again Oda has been inconsistent. I do think that if he did use it then we should see some bleeding ( Because it ignores durability entirely) from Kizaru if someone far more durable then him was bleeding from it. You can no touch with Haki if you use the bottom right which is barrier Haki.
So far Luffy used ACoC in the greeting clash, then COA+ G4, Then COA+ G5 except for WSG and now he reverted to COA+ G5.
I just wish both sides would just go all out. And Im hoping it happens next chapter hopefully.