I didn't watch here is just a good a spot as any to say my opinion on zkk and what might happen to kaido end of arc
Starting off with zkk
I dont think its impossible but i do think its improbable. Like even if it ended up happening its not like he's not gonna overshadow luffy. Also i just feel like there are alot more characters with deeper connections with kaido himself that if he were to be killed one of them should do it
Im still a big fan of him and hiyori being the ones to take finaly take out orochi for good. The scabbards already had there turn including denjiro and kawamatsu. Like i personally think it'll be extremely cool if lets say zoro is already feeling the side effects of the mink drug so he wont be able to physically attack him or protect hiyori. So he uses coc to actually ko him and as he's passing out hiyori cuts him probably with momo's sword she maybe brought
While zoro already hates him enough so he doesn't really need anyone incentive if the orochi kuina theory ends up being true even more of a reason.
King might also have more of a connection to zoro than we know of. Maybe to zoro's dad to mirror queens connection to judge
Kuri: Jack
Udon: queen
Flower capital: Yamato if kaido had his way
Ringo: king probably tho its not really confirmed could be hakumai another shimotsuki led region but doubt it
If kings hybrid with help of queens drugs or awakening (if that changes his form) resembles a western dragon even more of a reason. All the calamities hybrids are pretty weird looking so it wouldn't be too crazy. Jack being some weird mammoth centaur minotaur fusion and queen being some wanna be Godzilla and mecha Godzilla at the same time.
I already wrote way too much so maybe ill say my opinion on other options for kaido that aren't zkk later lol