King has been the acting leader of the Beast Pirates ever since the Onigashima event started
> Called out the tobiroppo to find Yamato
> Cancelled Kaido's prize event(challenging a calamity in case Yamato was found) to focus on the enemy
> Reports about enemies location and number directly to him, with him ordering to bring Momonosuke's head to him in order to break the samurai's will
> Reports about the scabbard's condition directly to him, with him ordering to kill the weakened samurai
Guess it's Oda's way to highlight Kaido's top subordinate