Nope I caught it... Maybe
These are 2 separate varieties Chooks man has that I believe your thinking of.
Chooks man has (I believe, I'd have to look back).....Black Marans and Black Coppers and each has their own Standard.
I don't think he was producing a black line from his Black Coppers because they wouldn't be pure not conforming to either standard, (Black Marans or BCM) unless he was doing it just for fun...I can't recall seeing any of these from him, tho.
Someone can correct me if I'm wrong here, but Betty is an over melanized Black Copper that doesn't adhere to the BCM Standard and she cannot in no way be called a Black Marans because she's hiding the copper. (Recessive?) So she's still a Black Copper, and not a Black Marans.
Hope I'm explaining that correctly.
As far as your question to me? No, I'm breeding my Black Coppers to SOP. If I decided I wanted an all black line, I would get pure Black Marans.
If an all black roo was useful to me, I could see it being fun to have but at the moment I'm trying to get my stock towards SOP, where an under colored or all black rooster would be useful for over colored hens to correct their progeny... whereas I'm trying to correct Kongs over coloring and this is where Betty fits in. I'm opposite.
Too much going on in that coop to have any fun...
And of course also trying to get the BBS Silver flock established.