Your a big dude, that's the thing... When you are not that big, you are going to go to the ground. Is common sense that you don't go to the ground in a brawl, but if you are small dude, you will, anyways a brawl is a brawl, size is the most important thing to have in there, and good hands.
Hip surgery, that sucks, hope you get better
217lb's cause I can't do any real cardio....LOL!
There's a good tactical point I was taught by an army vet. If someone is going to assault u why let them dictate the moment it turns violent? He was talking about firefights in hostile theaters and tactical ambushes, but the concept applies to the street, my old workplace or any potentially violent situation.
So someone starts escalating amping up to leave no option but assaulting u, interrupt that process. After time in an environment where assaults r common u learn the pattern of escalation by body language, facial expression and voice tone.
I can hear a bar fight starting before it happens now and regularly catch the eye of the security guys I know to point out where shit's getting physical or even likely perps who'll start shit later in the night just by how they're acting. I've tested that last point so many times now I trust it automatically.
As a smaller person, taking someone down by surprise can compensate for size differential and the advantage of control position when down. When we had people fighting and falling into other people or over chairs or tables I was able to use my Ukemi to fall in a dominant position.
Same thing applies to your situation, u got the ground skills to restrain, it's more in dictating the timing where it gets physical and getting someone down without cracking their skulls in the fall and landing where u have the dominant position.
Most people who start shit have had priors or brushes with the law, so if LEO shows up with u controlling an aggressor, he's not too banged up, u clearly explain the events of the encounter and have other wit's to backup your statement, even u acting first will not put u in any legal liability. But he's gotta be in undamaged shape, no serious injury, no trip to the ER than 99% of the time u r good to go!