Wow! You are too nice keeping Bruh.
I have a few ideas.
You can keep a basket muzzle on Bruh and/ or Draino. They can still eat, drink, and pant with it on. But they can not do serious damage to each other.
Here is an example of one link
I rescue dobermans and they are big and strong too. I use a "prong collar" to control them. You can buy them at a Pet Store. They will not choke Draino like a choke chain would. But, the work well to control pit bulls and such. I would put that on him, with a leash, to walk him outside.
I have a feeling that all of them may need more exercise as well. Then they would be too tired to fight. I bought a used treadmill and put my dogs on that when I do not have time to run them on a bike. Maybe your friend could come over and at least exercise Bruh. He would bark less if he is exhausted as well. Running in the yard is not as stimulating as walking
around the block. In the wild, dogs would run to new places, and explore, all day. So any mental stimulation you can give can help. Obedience training
wears them out as well because they have to exercise their brains
I did not ask but I wanted to make sure everyone is spayed and neutered. That would help too. If not, you can probably find a low cost place to do it. I worked at an SPCA sometimes and they will spay, and neuter, pitts for free.
I also thought you could go to home depot and get some sheets of plastic to put around Bruh's cage so they can not get to each other through the wire of the cage.
I also have a bark collar on one of my dogs as I had a noise complain on my front door one night. You can try a citronella spray type, a vibration type, or a shock type. I have never had any type work except for the shock collar. And while I do not like the idea of the shock collar, I have to respect my neighbors environment.
You can also use a training
collar on any of the dogs. Again they make vibrational kinds as well as the shock kinds. I buy the kind where I can push a button and the collar will make a sound. That is the warning to stop chasing the cat or stop ignoring me when I am calling you in the field. If they do not listen, I can do a small shock. Get one where you can change the strength of the shock. What seems to happen is after a few days, I can just put the collar on them and they listen.
You can also put one, or both, on an anti-anxiety medication. You would have to get it from a vet.
I hope this helps.
If you have additional questions, please reply.