This boy is SOOO rooster-y. He behaves like a fully mature rooster. Is that typical of BCMs? Do they mature faster than other breeds? At around 3 months, I had to separate him from the main flock. My older roo began running him off, and then some of my bitchier ladies would join in and attack him. (My roo never attacked him- just ran him off, then the adult hens would attack). At that point I hadn’t observed him acting rooster-ish at all.
He now resides with 2 same age pullets (a RIR & an Orpington mix) who are not nearly mature enough for his antics. He is also with a mature dominant hen who he tries to mate with when he can catch her off guard. He actually mates with the mature hen. With the pullets, he looks more to be attacking them. He also is becoming obsessive about the hens and pullets in the main flock, who he is separated from by a fence. He’ll pace the fence trying to get to them, rush the fence, etc… until the big roo runs him off.
I know he’s just a youngster and figuring things out. I don’t mind. Ultimately he’ll have his own flock away from the main flock. However between the coop build taking a little longer than expected, and him acting all roosterish earlier than expected, he’s in a temporary set up that works but is not ideal. My previous roosters never started this kind of behavior quite this early, and usually they didn’t mess with the pullets until they were around 6 months of age and closer to laying.

This is him at 14 weeks.
I guess I’m just curious if this is typical or not. Interestingly, I sold the other BCM chicks that hatched with him. The woman I sold 2 of them to posted pics on a FB group inquiring about gender when they were 9 weeks old, and multiple people who commented on her post told her that the birds appeared to be much older than she thought they were.
If maturing quickly isn’t a typical trait of BCM, is it possible just these bloodlines mature quickly? The eggs came from a small local farm. I don’t know anything about their breeding practices, but I assume they are better quality than hatchery birds, which most of my others are. I highly doubt he’s mixed with anything. What are your thoughts?
He is 9 weeks in this last photo.