This theory doesn't have the legs too stand on its own but its an interesting thought.
Jinbe mentions that Who's Who broke out of prison.
The rest I'm going to say is speculation; Who's Who broke out of Impel Down 2 years ago during Blackbeards battle royal to the death. Who's Who is a spy for BB and 10th Captain. The reason the 10th captain wasn't revealed was to ensure WsW's cover was sealed. Essentially WsW is X Drake for the Blackbeard pirates.
Jinbe mentions that Who's Who broke out of prison.
The rest I'm going to say is speculation; Who's Who broke out of Impel Down 2 years ago during Blackbeards battle royal to the death. Who's Who is a spy for BB and 10th Captain. The reason the 10th captain wasn't revealed was to ensure WsW's cover was sealed. Essentially WsW is X Drake for the Blackbeard pirates.