I agree w Wolfy on this one completely.I don't think there's a way to say it's the exact same gene in two species, considering no one has mapped the genome completely on either species as far as I have found.
I also don't think that he's proven that the dead hatchling was a super spider, because he cannot show a gene study that shows that hatchling had two copies of the spider gene.
I did have a male spider that threw nothing but spider babies, but that doesn't prove he was a super spider. It proved that I had good odds. There were some dead babies that didn't make it out of the egg, but that doesn't mean that they had two copies of the gene and so died because it was lethal, because he wasn't being bred to a female spider either.
I think he has a theory that could be true, but I know that there's a ton of breeders who have bred spiders together and did not report any abnormal numbers of dead eggs. COULD all those breeders be lying? Sure, but what is the profit in that? They would just not pair spiders in the future, so to get the highest number of viable eggs... which they don't do. Breeders still pair spiders(combos) without qualm. So I doubt that breeders "know" that spider/spider = lethal super spider.
Just applying logics, because I have no fancy degree.