In my world the Pirate King was the strongest pirate, but in his wake four pirate captains rose to the rank of "Pirate emperor." Red-hair Shanks, Whitebeard, Kaidou, and Big Mam. The marines alone can't combat all of the pirates in the world, and any two of those big four factions require the entire marine force of the Grand Line to deal with. So the shichibukai are ex-pirates who were offered sanction in exchange for help dealing with other pirates and to be at call in case one of the pirate emperors decided to make their move.
However, they're still pirates. They're completely untrustworthy. Crocodile tried to take over the world starting with Alabasta, Jinbei outright refused to help fight Whitebeard and went on a rampage, Boa Hancock is a bitch who fought more marines than pirates during the battle, Blackbeard broke prisoners out of Impel Down, and even the rest all have their own agenda.
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In my world the Pirate King was the strongest pirate, but in his wake four pirate captains rose to the rank of "Pirate emperor." Red-hair Shanks, Whitebeard, Kaidou, and Big Mam. The marines alone can't combat all of the pirates in the world, and any two of those big four factions require the entire marine force of the Grand Line to deal with. So the shichibukai are ex-pirates who were offered sanction in exchange for help dealing with other pirates and to be at call in case one of the pirate emperors decided to make their move.
However, they're still pirates. They're completely untrustworthy. Crocodile tried to take over the world starting with Alabasta, Jinbei outright refused to help fight Whitebeard and went on a rampage, Boa Hancock is a bitch who fought more marines than pirates during the battle, Blackbeard broke prisoners out of Impel Down, and even the rest all have their own agenda.