Seriously. I completely agree. I've seen tons of lesser pastels and this doesn't even seem possible in the range of those genetics.... Yes, BPs can have crazy polymorphism in their genetic combinations, but this seems too much. There's gotta be more, unless it is indeed a het or double het and that "underlying" gene(s) is not acting at all like simple recessive (because neither of them probably are) and is drastically affecting the appearance.
Regardless, that is a gorgeous ball with some incredible contrast.