It's good that you don't think he's trying to hurt the other cats and that's it's just too rough play and that they otherwise get along. Of course, that doesn't help your situation. Bratt was always the dominant cat over his sister, Joon. He would always make her cry. When I asked the vet about it, she said it wasn't a problem as long as Joon would eventually go back for more play, which she always did. Plus, they are of equal size and age. And I think Joon is just more sensitive because even little Stella makes her cry and she's not even a year old.
I hope the crate works out for you. Keep us posted as to how things are going.
I hope the crate works out for you. Keep us posted as to how things are going.