Holy shit, Kaido knows about Joy Boy. So he’s read Oden’s journal, then?
Also, Luffy looks pretty good here. He didn’t get crushed like people were trying to say last chapter, it was the haki exhaustion and his inexperience with it. Makes sense, seeing as how he’s using four different types of advanced haki (presumably barrier and penetration CoA, not just one of them) none of which he’s fully used in all out combat before, on top of the haki he was already able to use. So I get it. Little by little, he’s getting better with it.