You have to admire the raw honesty of someone who calls their rooster a "turd burglar" while simultaneously admitting they'd be heartbroken to lose him. That's the chicken-keeping experience in a nutshell, isn't it? You spend months raising a handsome little jerk, convincing yourself he's a decent dude, and then one afternoon you catch him sparring your beloved OC, John Cena, and suddenly you're googling "how long to isolate a rooster before he becomes soup." We see you, CrayCrayChickenLady. We feel the conflict in our bones.
Here's the thing about roosters at the nine-month mark: they're basically teenagers who just discovered they have opinions. Your guy isn't evil, he's young, hormonal, and confusing dominance with being a menace. The fact that your hens are peacefully coexisting without him tells you everything. He's the instigator, not the solution. But here's the hopeful part: you caught it early, no blood drawn, and you're off work this week. That's a cluck-tastic window of opportunity. Keep him separated for a full seven days minimum. Let him cool his spurs and remember what solitude feels like. During that time, handle him daily, pick him up, carry him around, make yourself the most boring, unthreatening thing in his world. You want him to associate you with safety, not a threat to his flock.
Reintroduction is where most people chickening out. Don't just toss him back in the run and hope for the best. Start with supervised visits in neutral territory, not the coop, not the run, but a fenced-off patch of grass where nobody has territorial claims. Let him see the hens from a distance first. Then let him approach while you hold a broom or a rake (not to hit him, just to create space if he gets spicy). Watch his body language. If his hackles go up and he charges, separate again and try the next day. If he acts like a confused gentleman, reward him with treats. You're retraining a teenage brain, and that takes patience, not punishment.
Are you wasting your time? Maybe. Some roosters never learn to be decent flock members, and that's okay to admit. But you're not there yet. You've got a young bird who was decent until recently, a clear trigger (the illness and disruption of pecking order), and a week of intentional work ahead. If after two weeks of careful reintroduction he's still terrorizing your OCs, you have your answer. And hey, you're vegetarian, so the meat question is moot anyway. But if it comes to that, there are plenty of folks who'd happily take a young rooster for their own flock or freezer. The community you called "ripping" will help you find one. For now, give John Cena some extra mealworms and give that feathered felon one last cluck-tastic chance to prove he's more than just a pretty face with a bad attitude.