I don't think he fits any possibility other than a regular pied. He's too dark for a yellowbelly pied and he's too light and too low white to be black pastel pied. Honestly when I saw the first picture and hadn't clicked to enlarge yet, my mind immediately went to pastel pied. But upon closer inspection, the color is wrong even though the pattern screams it. Either way it would have been impossible with the pairing but you never know, retained sperm happens.
He really is exceptionally beautiful and definitely has some cool funkiness going on with the color and patterngreat pick up! Probably the nicest or at least one of the nicest single gene pieds I've ever seen.