I think he's a slow developing male, too. This variety usually has rose combs and pure white plumage, so I'm guessing he is more of a mixed color regardless of what he was sold as.
In my opinion these are females since they have a well defined chipmunk pattern. Both males and females of this breed are barred, so both can have the head spots.
It's difficult to tell for sure in the photo, but I *think* the chick has a pea comb. If that's the case, the mother has to have a pea comb, not a single comb.
If that is not the case, the mother could be any of them. I would suspect the Sapphire Gem, since the chick's fuzz shows not trace of...
He isn't a perfect match for any breed I can think of. He is probably a mix or a hatchery hybrid of some kind. He has beautiful coloring. I'm guessing black copper Marans was in the mix.