Law is of course able to damage Kaido because of his devil fruit and his ability to bypass flesh going straight to Kaido’s organs using Gamma Knife.
Kid is the tank. His metal protects him from most oncoming attacks, which is like giving him extra HP for the fight. It also allows him to manhandle giant targets like Kaido in ways the other’s can’t, like he’s Brock Lesnar.
Kid seems to be going the most chaotic way about how to injure Kaido and that is by trying to crush Kaido’s insides. I saw people confused on how Kid injured Kaido in chapter 1002 with that slam, and that is because Kid didn’t try punching or stabbing Kaido, he literally slammed him, just because Kaido’s skin is damn durable. When Kid slammed the shit out of Kaido think about all his bones and organs getting hit by the shockwave and slamming into each other. His skin’s durability won’t protect his insides from that.
Killer, almost in contrast to his captain, is lithe and agile, using bewildering and swift attacks to create an illusory effect of pain onto Kaido.
Killer surprised me the most being able to use sound waves to injure Kaido’s insides as shown by his Sonic Scythe move, which was shown in an illusion form so we could visualize how deep the sound “cut”.
*by KiriNigiri
