CP~ Roo #1 has it going on in my opinion even with the white feathers. I discoverd a white feather in Gnarles too not long ago. I asked Blackdotte about it and here's what he had to say about white feathers and fluff. I also included the links to the discussions over in the Wheaten discussion thread. Hope it helps.
drom~
As per your request, here is the response I received from Blackdotte about the white feathers and fluff.
Me- "I read somewhere that the white feather in the hackle and the tail could have been from cuckoo in the background."
David- Old wives tail not genetic correlation with either Cuckoo or Wheaten.
Me- "With the possibility of getting a BC looking pullet from a crossing BC's and Cuckoo's, wouldn't there have been a chance that in the beginning some inexperienced breeders may have thought that the BC looking females from these crosses where still pure as BC and then sold them as such and a unsuspecting new comer to the breed continued to breed them as if they were and so on."
David- "Yes , and not only "inexperienced breeders". I think it has been a widespread practice in the US, and the only logical origin for the numerous cleaned skanked Black Coppers that are only found in the US, and no where else in the World."
Me- "I have 2 BC males that both show white feathers in their hackles, when the hackle feathes are lifted to look at them more closely, I can actually see the white coming in in the form of barring, faint as it is it is barred. What gives?"
David- "Are you saying you have both distinct copper and white feathers in the neck hackle, or the undercolour (base of the neck hackle feather is white? If the latter it is normal. The barring you see is just shade variations, again normal.
If barring was present you would have an obvious barred/cuckoo patterned bird."
David
And a second response-
David- "White feathers in tail, wing etc can be an inherited defect, or can be caused by a damaged feather follicle. When pulled they will often grow back the correct colour.
White feathers in juvenile birds should be ignored.
White fluff at base of tail can also be an inherited defect, but can also be hormonal. It is common in just about all breeds"
These are a couple of links to the Wheatens Marans thread that has had quite the discussion on white feathers and fluff. This link is David's response.
Hope it helps shed some light on these issues for us all.
https://www.backyardchickens.com/forum/viewtopic.php?pid=5274452#p5274452
https://www.backyardchickens.com/forum/viewtopic.php?pid=5276793#p5276793