I made a list with users and their fruits: onepiece.fandom.com/wiki/User:Capitán_Noot/Devil_Fruits
Surely he lost his hand before eating the Suna Suna fruit.
Luckynero Why? Because Luffy and Kid are super rookie captains and Zoro and Killer are members in their crews who also are super rookies? Only for that?
In their first appearence each one was in different places. Then they are seen together for the first time in the auction house, when after Kid gave a speech about how the world is Killer gives him the reason.
Oh, yes, that's typical of Luffy and Zoro, of course.
Sorry to make me sarcastic, but Killer has only shown himself so far as a background character whose personality is barely known. And the same goes for Kid, he is only known to be a temperamental man.
Whiz Almighty actually, Killer's personality and his relationship with Kid have never been shown much. It is known that they are friends since childhood. Maybe he has taken command now being one of the three ringleaders of the alliance along with Hawkins and Apoo, and along with other Kid Pirates like that Boar Gifter now they work for Kaido, but with the intention of rescuing Kid.
Years ago I heard theories about Killer abandoning Kid. He may have mutinied against him and now he is the captain of the crew.