So, the rest of the story... I found some past posts on sharing broods and one thing I took to heart was that if it ain't broke, don't fix it. I watched for the hens to assert dominance, fight or otherwise pose a problem for themselves, the chicks or me. As it turns out, they are enjoying...
One bantam hen ("Red") decided to brood and started to sit on a clutch. A second ("Blondie") would visit her and (I suspect) add to the clutch with a few eggs of her own. Last week they started nesting together and now we're hearing peeps.
This is our first go at this and we're wondering...