Wow that confused me for a sec ... I thought you were saying that the homozygous Daddy Gene looked like a super stripe.(I'm thinking, "Wow, I want to see a picture of THAT!!")
I think that OWAL was getting at is that the homozygous Daddy gene looks exactly the same as the heterozygous Daddy gene -- eg, it looks Normal.
I have read somewhere that RDR bred Platinum x Platinum and got Platinums, BELs and Normals, and the normals can only be homozygous Platty gene animals. (I'd love to see the original source of that if anyone has a link, though, I since I couldn't find it ...) I don't know if breeding trials confirmed the homozygous Platty ...