Need to update this. Only got 5 Cinnamon Queen pullet chicks at TSC. Didn't try to put one under the silkie hen. Put 2 under one of the full size hens and 3 under the other after dark. The next morning all was well. It still didn't goes as planned. Better. The chicks were already bonded. They seemed to prefer the Dark Cornish hen but then they all decided to take on whichever hen had the food. The two hens are sharing the chicks now. The Dark Cornish hens covers them while the Larger White Giant hen rushes out to defend their fortress. I've never seen such or ever thought this was possible. I've got a rooster that fed chicks and inspected their nest after hatching and still refuses to eat until the hens are fed.