The hens back could be infected. And the rooster is probably really sore and hurting. Just give them attention and let them do there own thing. (-;
Also make sure they are comfortable were they are and they are liking there food. Try to get some healthy feed for them to eat.
The to bullies are probably closer in age and older. Try putting them in a separate cage or something. But make sure they stay in the same area so the can be around each other, and not peck each other. Also give all chickens the chickens the same qualities!
Good luck!!