if I breed a visual female, I agree they will all be 100% hets. I also agree in what you're saying about a visual passing the gene. what I'm saying is how do you know for sure that the visual male passed his gene to the hatchlings and be 100%?
1. retained sperm
2. parthenogenesis this is rare, but it is more common in reptiles and insects. I know a breeder who had a virgin female normal and the first year was breed to a killerbee (super pastel spider) had a clutch of good eggs. next year was breed to a 3 gene male with super pastel being in the snake. again had good eggs. the third year it was breed to a super pastel champagne got 5 eggs and all 5 were normal females, no pastels at all. this breeder at the time had a small collection, keep very good records. yes a mistake is possible, but knowing him, parthenogenesis makes more sense.