I own a Pied. My answer below is based on my belief from your picture that the scales have changed color between sheds, and the scales are normal in morphology etc etc, nothing more.
While I have NOT seen this color come in after a shed against the white, I HAVE over time observed black scales to come in. Typically it's 1-3 scales clustered together. "First" shed they appear grey, it makes you think there's dirt on them, then after 2nd shed they come in completely black. On a rare occasion a few scales have turned from white to black in ONE shed.
I talked to other owners of Pieds at times, and many have reported the same observations I have, ie white scales to black.
While Pied genetics are proven, what is not understood at all in most animals, including humans, is epigenetics. Epigenetics is at work here with my Pied, and yours as well IMO.
I suspect you are observing the same thing I have observed, just a different color.
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