Well, here's an update. I had put 2 chicks in with Jazz and Stout. Jazz quickly accepted the little partridge baby that had been hatched the day before. The second one, the little black guy had been hatched a few days prior, Jazz didn't care for because it was too active. She wanted them to stay under her. Last night I was putting everyone away and went to check on their progress and it was just the sweetest thing. Jazz and Stout were both huddled up together all flattened out and when I opened the cage door, this little tiny head poked out from between them. So far so good.
I moved the black to brooder #2.