I'm still wondering about this! Is Doma "The Bohemian Knight" and Shanks Crew arriving on Marineford, are these guys related or something? Because both of them got a monkey on their back.
The guy in Shanks crew and the Bohemian Knight Doma are probably not likely to be related. But maybe they're both part of a tribe where the use of primates on their back is part of a fighting style.
It's probably gonna be part of something big in the later future like a group of fighters that fight with monkeys
Thanks for your answers guys. Let's just wait for One Piece's future.
What do you think?