Connie, I think you are great at explaining everything. And everything you have said goes along with my years of education and the last 2 months of feverish reading on how the various morph genetics work and interact.
You didn't confuse me by throwing pinstripe into the mix. I often say qualify statements with "as far as I know" or "it's my understanding" when there is not a lot of evidence to be certain. I think that it will be interesting to see if the homozygous spider turns out to be lethal or not.
I just think that being dead should count as looking different and therefor constitute a super form making spider codominant.