Crowcreek, in my experience, (I have 5 Roos and 6 hens/pullets in the 'brights) the lil Roos are most aggressive when their ladies are around. My old Roo is a golden, and he lights me up every time that I feed and water them in their tractor. If I take him to where he can't see the hens, he calms down and lets me pet him. Remember that Darwin's theory of Natural Selection was actually started by Lord Sebright. Sebright used the development of the Sebright chicken to prove his theory, I have read. They are very aggressive/protective, and will not let you forget it. Mine aren't mean, they just don't tolerate Anyone messing with their Ladies.
I love the pic with them walking down the stairs in a row. You couldn't get a better pic with human actors. That is priceless. It'd be my avatar pic, if any of mine did that! haha
I have a 2 month-old Cockerel that was hatched in a Barred Game/Amie/OE combo clutch. I put 3 Bantam eggs under my game broody hen, last time she went broody. I just let them run with the rest of my Standard egger flock. The 'Bright, ALWAYS has a high perch, and will get in the face of roos that are 50 times his size. The big guys usually look at him funny, and walk away. I watch them a bit closely, tho. Once , my Avatar roo ruffled his neck at him, the lil guy ruffled back, then flew up on top of one of the broody pens and crowed his little heart out. Discretion being the better part of valor, I assume...