In my opinion, the straw hats during their last voyage to laugh tale will not only comprise of the 11 core members(including Yamato) but also Momonosuke, Vivi, Shirahoshi, Rebecca, Carrot, Bellamy, Grand fleet captains and Law(not sure about Kidd) but before they can enter the island BB will confront them with his fleet.
The straw hat grandfleet will also show up; therefore BB will propose that him and his 10 titanic captains face off against Luffy and 10 other people all over Laugh Tale in 1 vs 1 so the winner will still have manpower to fight the marines who are waiting for both of them to exhaust each other; therefore, only 11 people fight from both sides
After the fights are over they all go in and lie witness to the secrets of the world
The straw hat grandfleet will also show up; therefore BB will propose that him and his 10 titanic captains face off against Luffy and 10 other people all over Laugh Tale in 1 vs 1 so the winner will still have manpower to fight the marines who are waiting for both of them to exhaust each other; therefore, only 11 people fight from both sides
After the fights are over they all go in and lie witness to the secrets of the world
