The barred chicks are either barred rocks or male sex-links because they have straight combs - dominiques have a different type of comb. After seeing the new pictures, the dark chick is definitely a female BSL.
Male BSL chicks have barring and look a lot like barred rocks, while the pullets are black with the brown feathering. I've raised BLS pullets & BR pullets, but no cockerels and can't tell whether your barred chicks are BSL or BR, but am suspecting BSL cockerels. Maybe someone else can tell which they are.
I hate to ask for another picture, but if you get a chance, post a couple photos of the darkest barred chick (the one we thought had the possibility of being a pullet). I'm not seeing much difference between them in the last group photo.