I just got this new 4 month old male kitten. He was rescued and then adopted out for only a month before the adopters said he was too wild for them and got rid of him. I took him in with my two other kittens one is also 4 months and the other 11 months. Since he’s met them he has not stopped growling and hissing. When we play with him alone he is constantly growing at the toys and in general. He walks around growling. He will go up to the other cats but than his right away. My cats have done nothing but try and interact with him. They haven’t shown any aggression. I’m not sure what all this means. I waited days to introduce and he’s still very aggressive towards them and they aren’t aggressive at all. We have been feeding them together to get good reinforcement out of it but hasn’t worked and growls the whole time he’s eating.Any tips or advice would be great!