It was really a nice chapter.
I honestly was on the side of "Oda forgot Ashura" or "Zoro has new strongest attacks and that's why he doesn't use Ashura", but I was wrong about It.
Zoro went beyond all my expectations, I thought he was weaker than Law, but I was wrong again. Roronoa really did great against Kaido, he even left a scar and was confirmed to have CoC aura (which Is likely a first step of it). Law wss shocked by Zoro's endurance and Ashura, which confirms that the fighter of strawhat Is likely stronger than him, but he did great too, he showed to have improved a lot since Dressrosa, and I think he's currently above Doflamingo.
Now the two of them, can rest and go down to help, they did great defending Luffy and Zoro also replicated Oden's feat, so his fans should be happy about It.
Luffy is of course the main character, so he did main character stuff, he understood that armament wasn't the only haki who could cover his fists, and he got that, like Kaido, he had to use Conqueror haki too.
Luffy is insane, I totally didn't expect such a growth from him, and I thought that Conqueror haki would have been explained with Shanks, but anyway, strawhat really showed to Kaido who will be the Pirate King.
Adv. CoC Luffy did even better than Ashura Zoro while not using gears.
Now, I think that Luffy will fight Kaido until Yamato appears, since he said he wants to fight against his father, alongside Luffy as "Kozuki Oden".
I think that Kaido will recognize his own son as the samurai he was waiting for.
Last thing: Kidd.
Kidd as Luffy's rival will take down Big Mom while Luffy will take down Kaido, the 2 strongest supernovas are monsters.
I think Eustass will use Adv. COC in the same way as Luffy to defeat Big Mom.