My guess is Kaido's highest ranked subordinates/partners follows a Royal Flush Theme.
The Ace: Joker?
The King: Kaido, King of Beasts
The Queen:???
The Jack: Jack of the Drought
The Ten: Probably X Drake. (ancient zoan user we know affiliated with Kaido, happens to have a multiple references to the number 10 (Diez, X) in his name)