Greetings
austintexasredhead,
I hear in your words, that you also care about your rooster. I understand that, totally.
But, here's my experience with roosters...not only are they social creatures, they have
instincts, and
intelligence. Roosters are a lot like parrots, as far as their capacity to learn. Even though a parrot ranks higher in intelligence. Thus, I have had great success in training my roosters. First they learn, I am stronger, then, they learn words and phrases.The phrase, "No Peck", is the first thing they learn. Some learn by one year old, some like my current, RIR, "Frito", learned by 1.5 years old. He was very powerful and extremely aggressive as a youngster. Now, he is my buddy, follows and comes on command. If I tell him not to bother a certain hen, he walks away. Yes, he knows all the hen's names, the cats, and the dog's too.
Training a rooster involves understanding the instincts and over riding them by appealing to the intelligence of the bird, with training. And even with training, instincts will sometimes overrule. Especially when hormones are riding high, like now during Spring. But, here's where maturity, along with training can allow the rooster to develop into a well rounded leader of the flock.
Here's your problem - your rooster has been learning from his instincts. These instinctive behaviors of
aggression, have been reinforced by your decision not to intervene. So, in a way, you have taught him this is OK.
I have read that chickens can learn over 300 words, and recognize 500 faces. Their level of intelligence is usually dismissed, because it takes a lot of time to train them. Time that many keepers don't have. Running a farm, homestead or family can be demanding and time consuming.
To answer your question: will isolation help. No. It most likely will make him either depressed, and/or, more aggressive.
I don't know if he can un-learn what he has already been doing. In the future, there are going to be hens that he doesn't like, or that don't like him. During breeding season, roosters don't take well to refusal. There are many posts, about roosters even killing hens.
In my opinion, this is a challenge for a keeper that has the time, patience, and experience to correct, if it is possible.
These are my thoughts on your rooster. I hope they are helpful in some way.
God Bless