referring to purely phenotype you are correct.
how ever genetically 25% homozygous dom, 50% heterozygous dom, 25% Wild type is the expected outcome. We did not see evidence of a homozygous spider, so something else is going on.
referring to my first comment, to dominate over something just referrers to the phenotype compared to to something else. We classify morphs based off their dominance comparing them to wild type. Albino is recessive compared to wild type, pastel is incomplete dom compared to wild type, pinstripe is dominant compared to wild type. I was just throwing out theories on how it could happen, hence a recessive trait could dominate over the spider and make it look normal. Iffy... sure, all it is is just theory.