i mean whats the point of kidnapping him? he aint a royal, an admiral, or anything at all, i mean not for now.. what if just what if Blackbeard took him to give koby a gift as a thanks for helping him get the territory that blackbeard was talking about?
this could be a devil fruit ability this df ability might change the whole koby thing as weak or something, and we might see him on this upcoming arc right now…
Laffitte is known for being a brutal Sheriff, and can hypnotize people. Koby knows about Egghead Island, and the Pacifistas. Blackbeard is going to have Laffitte hypnotize Koby, to learn about the Seraphim, Sword, and Vegapunk.
Koby getting capture by Blackbeard is horrible for the Marines, he knows a lot about different organizations. Also, if Blackbeard figures out Koby used to work for Alvida, he can blackmail him by threatening to reveal to the Marines that Koby used to be a pirate, which would get him kicked out, most likely.
Since Koby is an apprentice of Garp, and Aokiji is also close to Garp, Blackbeard can also use Koby to manipulate Aokiji.
Great play from Blackbeard here, he gets information on Vegapunk, Sword, and gets a tool to manipulate Aokiji.