I have a feeling that kaido's son is a nice person but insanely strong.
I also think bigmom is plotting something against kaido. I mean, how on earth the alliance going to fight to yonko pirates plus samurais.
If bigmom n kaidou form an alliance, they can make some agreement to let kaidou hold luffy as hostage and hand him over to bigmom.
Hence, bigmom possibly leave the country while waiting for kaidou to settle the bussiness
All types of haki have different level..
Cannot wait to see luffy unlock his advanced coc.
Maybe, advanced coc is the ultimate level u have to achieve to find one piece n be a pirate king.
Somehow, luffy would still finally manage to beat kaido.
Logically, he won't be able to defeat the like of doflamingo(who mastered awakening), and katakuri (better coo and Coa). But he still did.
Why? Because he is the protagonist