Like I said, I'm not talking about other morphs. I've seen the pattern in them quite often as well and I understand that most of them are not Het for Pied.
What I'm mainly asking is if anyone has seen normals (or Hets for recessives other than Pied) that have this marking. I'm guessing not, but if so, I would bet on it not being proven, i.e., has yet to produce Pieds after a few clutches with a visual.