Highly doubt Kaido had "protect Yamato" in his will
Kaido wants to protect Yamato, that's what I believe. King knows everything about Kaido, and he knows what would his captain want if he was alive.
we saw how Kaido beats Yamato in this page:
but suddenly few pages later, instead of seeing a KOed Yamato, we saw both Yamato and Kaido standing in base form, so how can this be explained? how did Yamato stand again if Kaido didn't stop hitting her, why did Oda skipped that part of the battle?
She also asked him, why did he steal her freedom? why did he steal Wano's freedom?
he answered: life isn't a serious of simple questions & answers.
so there's something suspicious.
Dragon said it already: