Freakie, I do believe Randy was reffering to when Spiders and Pins are paired with each other and not a combo of the two different genes. I could be wrong, however Randy knows his stuff when it comes to genetics and I believe the sentence just came out wrong.
As for lethal genes, well considering how long it took for breeders to admit to the neuro problems with spiders, I wouldn't expect strait answers on this one. The breeders with the largest sample sizes, that may have answers, generally don't want those types of things made public for fear of bashing a project and upsetting those that have already spent money with them. There will be plenty of opinions, but not enough hard facts to back them up either way.
Can you tell me more about this spider problem? I was considering getting a spider tobreed with my pastel,now I am a little nervous about it!!