If only I saw it as being that simple.

Henry's genes were fine. He lived longer than most roosters and cockerels and, by the time I got to know him, had settled into being a very stable easy going chap.
Glais has more going on in the intelligence department I think. What that translates to when he's matured would be interesting to see. I can see his brain soaking in stuff. It's a bit unnerving at times. I've been doing something other than watching them and can feel I'm being watched and sure enough, Glais is standing a few metres away intently watching what I do.
I've found there are three states that can radically change how a rooster reacts to you: in their coop, in their run and free ranging. It's in their coop state that has given me the most problems in the past. Glais looked a bit too nervous when I was lent into the coop, or when I've had to get in it to do something. This was where Mow was invaluable. Glais, while not loved up with Mow worked out very quickly that Mow knew stuff and Sylph looked up to Mow. Mow is unbothered by me in the coop. She'll come into roost while I'm cleaning or working. From the point where I thought Glais was nervous (don't want nervous cockerels in a confined space with you) I spent more attention on Mow at roost time. I would crop check her making sure Glais was watching, stroke her back, lift her tail feathers and even move her on the roost. Mow doesn't fuss and Glais sees this. I can do the same with Sylph but she's a fidget and she knows she's Glais's hen and he might not approve of her letting me fuss over her.
(Yes, I do think they think of these things.)