Sounds like your integration was well thought out, I am also a big believer in "baby steps" if there is concern regarding aggression.
I am a newbie too, have three 11 week old standard chicks and 3 older bantam hens. All are on starter right now (the 4 year old bantam hens were recently...
She read it on this site (or at least I did so she probably did too). It says that in the article on "Raising Baby Chicks" in the learning center. A whole lot of new people (like me, and the op) will read it and assume it is true if it is part of the site learning section.
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