After looking at the ID photos at the hatchery, I'm leaning towards Gray Girl being a Blue Cuckoo Marans, especially since she has that pale spot on the top of her head.

She looks dead-on like the Blue Cuckoo Marans example chick photo too.
I am thinking the runt is an EE too, I don't think it's considered a rare breed but they do have Lakeshore Eggers, Steele Eggers, and Olive Eggers, and I figure it could be any one of those. It definitely doesn't look like any of their other breeds so I figure it has to be a hybrid, they don't have an all-black chick under any other breed that I've seen. It wouldn't surprise me if an EE got in the mix somewhere, but I don't mind, I love colored eggs!