In online slang here, for gay guys, "0" is people who take it, and "1" is people who give it, and you know, Crocodile didn't have any girls around him unlike the other big bads of One Piece, and he was only with Mr. 1 in Impel Down, and he's Mr. 0, and Ivankov implied that he used to be a girl or some secret like that, and, well, hmmm