At nine months he's feeling pretty cocky.
I almost butchered my roo because he kept challenging me, but he has since settled down nicely. Just this week I had to do some routine maintenance on the whole flock. I was worried he would give me some flack about it, but he stayed right away from me while I was busy in the coop. I grabbed each girl (all 18 of them) off the roosts, treated them, checked them over, and then set them loose. Some of them screamed bloody murder, flapped around and basically made a nuisance of themselves, but he let me work on everyone without so much as a dirty look. He checked the girls over thoroughly when I was done with them and seemed to be reassuring them that it was OK. I was quite impressed. He was always fine with the girls (a little rough when he was younger), but he tended to be aggressive towards humans. A little time seems to have alleviated that. I still don't trust him as far as I can throw him, but at least he isn't actively fighting me like he did when he was younger.
Maybe give your roo a bit more time to settle down. If he persists, then enjoy him for dinner. Too many good roos looking for homes to put up with a bad one.
Good luck.