Do we think that since Mow and Sylph are mature hens, and have had experience with a rooster (Henry), they would do any necessary training with Glais?
I don’t remember how old Glais is and whether his brain has returned to his body yet.
They will surely give him plenty to think about

. I expect him to think he's quids in: two females all to himself, instead of being the youngest of a relatively long line of males soon-to-be competing for female attention

Hopefully he'll attempt the bum-bump rather than the neck grab when he does try to act the part (there are both types here he could have modelled himself on). His dad is the former, but I can't imagine he knows which one is his dad, any more than they know who their chicks are (and which is why all the roos are good with all the chicks in a communal breeding situation).
He is 18 1/2 weeks old now, and his brain hasn't ever left his body; I'm beginning to wonder if it will, and if what we call the jerk phase is actually fallout from unnatural keeping conditions. I have developed the suspicion that the presence of multiple mature males here is responsible for all the cockerels' good behaviour this year, along with the rest of the social-behavioural training he's had since his broody (who was Oxwich) drifted apart from him btw. I think we might have the idea that the mature hens knock cockerels into shape because most people don't keep any or enough roos. What I've seen this year is a lot of cockerels observing interactions between adult roos, and, as a result I think, keeping their heads (and crows) down, and growing their tails very slowly.
The hierarchy among the mature roos is very obvious whenever one of them wants to exercise his rights, which is not often, but unmissable (that is, of course, the point, so the flock knows who's whose boss). No cockerel with an ounce of nous is going to invite that on his head as long as he can avoid it. And as long as he doesn't compete with the mature males, that long he can live in harmony with the flock, or so it seems here, in 2025.