Its amazing because it cant have been a few seconds from when orochi disagrees with kaido to his head being chopped off. And we can clearly see king holding his scabbard up so he knew full well what kaido was gonna do.
First the situation with Big mom ship, then the situation around Yamato and the flying six and now the sword scene, you can see the bond of friendship between Kaido and King, he is really his vice Captain. Overall the trust of Kaido to his Calamity is nice, but between King and him it is more special similar to Shanks and BenBeckman. Even when King use Kaido name,he wasn't mad at him because he trust him. I know King was the last step, Jack and Queen get enough screentime, Kings will surpass them and the hype around him going be insane,can't wait already.