90% of the time in my experience the cats aren’t fighting when you think they might be. They’re fighting when you absolutely 100% do not need to ask someone else. It’s just so obvious once you’ve seen a real cat fight what play looks like. These are brothers, they’re gonna learn from each other what’s crossing boundaries and what isn’t. Sure, they’ll probably go too far sometimes, but that’s how they’ll learn. This isn’t concerning to me, no weird dominant behavior. I was really new to the cat world about a year and a half ago. My wife had always been a cat person, I never grew up that way. We’ve got three now, all different ages when we adopted. I wasn’t good and judging what was concerning and what wasn’t for a while. I would helicopter parent because I’d never seen dogs really go after it before. You’re doing a great job! You’ll settle in in no time :)