Consolation prize >>>> kidd being captured and luffy also being captured for 0 purpose or reason to advance plot.
Blackbeard : "let me capture koby since his life can change the world"
Kaido to asura doji, kidd and luffy: "become my subordinates since I want more men wororoorroroorrooro"
What was the purpose of Koby getting captured?
Was it related to him and his journey?
No
It was a reason for Garp to fight Aokiji lol.
Kaido recognized Luffys strength. And Luffy went on to beat kaido.
BB wanted Coby to trade with the WG lmao. And he didn't even plan on it. He was like " Oh shit, my commanders got negged by Boa and Ray. We gotta get something to show for the trip all the way to here. Quick. Grab a random marine. Maybe that pink haired twink"
Consolation price coby