I agree and currently have a hen with 11 chicks in a flock. It is helpful if there are a few obstacles in the run, I have a large wire cage set kitty corner to the run, and often I saw my broody with her brood in that corner. But they often came out and walk around the hen, they are not trapped in the corner, and other hens could go back there, but they generally don't as mama is a bit fiesty.
Last year she raised a brood with out a rooster, (I got fertilized eggs from a friend) and when it got very close to hatching I locked out the layers. But this year, she just had them out of the coop by the time I got down there that morning. I do let mine free range quite a bit, but they all get along. And the very best part is that there is almost a seamless integration as the chicks get bigger.
MrsK