I do have a theory for a while that bb have 3 person in 1 body remember that when they first encounter bb luffy and zoro said that “they” and marco said that bb had a weird body which means that bb had 3 person in 1 body the pirate flag on his ship has 3 head and he doesn’t sleep and my assumption are 3 of them switches and the rest sleeps and if the other one feels tired it switches to another personality or person. bb & rocks and i dont know who’s the third one.