Hmm... Kaido has a son?!! Peculiar. Too early to comment about the guy. But if the guy ends up being the "Ace" i.e. stronger than King, most Zoro fans will lament championing Zoro vs. King. But for me, this is most fortunate because I don't like King.
I don't understand why Oda keeps characters in sillehoutes. It serves no valid purpose when he is doing it for the flying six. Among the three shown, the middle one appears to be a woman - may be Nami or Robin's opponent?! The one on the right looks awfully like Page1 and if that is the case, then so much for somebody reducing enemy forces.
Finally, does Kaido say musuko exactly or a genderless pronoun?