Well, we can guess his methods.
This is a good sign Oda will give Kid vs Linlin some focus.
I can see why. Kid's crew feels like a family first, similar to the Straw Hats. It would make sense there aren't defined ranks within the crew in that case. There's just a captain and crew mates who are good at one particular thing. But like Zoro, Killer is the Vice Captain in spirit.