This is very interesting and the first I've heard of it. But what's really interesting is I just recently read a post from a breeder, can't remember where but I'm guessing facebook, but it was about his blanchi project I think he called it, or black pastel enchi project. It relates to this specifically because the jist of his post was that he's been trying to make more of them but he just can't seem to hit a black pastel enchi again and he said he'd tried for the last 3 years or something like that but can't hit it. He listed a bunch of pairings which I can't remember now but I believe they were all using his black pastel enchi. Now that would make a lot more sense than just being unlucky. The black pastel enchi wouldn't be able to reproduce itself unless it got one or the other genes from the other parent if they are allelic. This post would almost be proof, he listed quite a few pairings he tried over the years and did not hit one black pastel enchi. I just wish I could remember where I read it so I could confirm, but this would definitely make sense and I'm sure this breeder would love to realize they are allelic as well so he could understand why he has been so 'unlucky' lol.