According to everything public so far, butter and daddy are allelic so there is no super to hit. I wonder if it is a butter daddy x BEL paradox? Also you should of only had BELs, Butter Daddys, and Super Daddys (Which look like nice normals as far as we know). So I don't where the butter came from either. The "hets" shouldn't be hets, they should be super daddys, breed em to a BEL and make all Plattys.
Could you post pictures of the parents with some background info on where they came from? also could we see the other babies from the clutch? This is very interesting. Maybe the gene doesn't work as previously reported?