I rehomed 3 brown leghorns that I started with. Every chick I got after that was unwelcome and they did not do well together. It took me a while to realize that the B.L. weren't going to change. Since I let them go my coop has been so calm and the chickens are much happier.
I am very happy for you. I don't have the guts to try and integrate chickens with other chicken with other chickens I just got 3 coops. The biggest coop has 8 in it, and the nick name for the chickens in that Coop is "Pretty Girls". The second coop is in the Garden and those chickens are called "Garden Chicks". The third one has my Cream Legbars and I call those the "Dr Suess" chicks. I have room in the Dr Suess coop for a couple more, But I am afraid that they will not get along. So I haven't tried it. Your brave.