>>693695Crip is in 4B because conceptually he is a character that when he shows up he's gonna do something cripple fucker related, like try to fuck a cripple. Having him in the main class would mean that every episode showing him in the main class would have to have him staring creepily at the disabled students in the class or else it would be out of character. But that would be too distracting/bring too much attention to him even when he isn't supposed to be the focus. He is a character that commands a lot of attention in that regard.