So, as it turns out, our bonus chick rooster, Corn, is a Cinnamon Queen breed:
Corn, our Cinnamon Queen King.
We had our Catholic homesteader friends from Indiana visit this weekend, and we talked about our respective operations. In conversation, we checked a bunch of chicken charts and figured out that Corn is a Cinnamon Queen. They have some CQ hens, so the coloring and size was familiar.
Thing #2 also discovered one of our black hens that escaped the electro-net to build a nest and lay an egg by the shed. So that's fantastic, having to double-check mystery spots for eggs now.