I guess King is saying something to the effect of “Kaido…I” and proceeds to get knocked out. I don’t think there’s a doubt he’s likely Kaido’s most loyal subordinate, at least on par with Jack, but King gives more of a sense of a partner in crime who’s been with Kaido since the beginning, and believed in his desire for a world of violence. A shared vision for the future. Was King trying to get back at the world for wiping out his people?
it’s a shame we’re given all this just as he’s defeated.