I think it works because you know your chickens so well. Long time chicken keeper told me a rooster (or mature cockerel) will be good with chicks. She's the lady that took my accidental EE boy RuPaul. She had a dozen pullet chicks, about 7-8 wks in a barn stall, and she just stuck RuPaul in with them. He actually acted a little scared! Both the chicks and RuP were going to a friend of hers who wanted chickens, so it all worked out great. Got to see him a couple of years later, and he was doing just fine. Even had a couple of youngsters of his own running around. Gotta love a happy ending!