Naw, catshow folks are more interested in cats as objects to be displayed, collected, discarded if imperfect. The consensus of a general list of cat-lovers is much more convincing. To switch over to the business of dog shows for a minute, has anyone seen Best In Show?
I think the garden variety and the tortoise-shell calicos are just a couple of different examples of mutable DNA in cats. There is a distinct difference in the type of patterns (I've noticed on the tortoise shell calicos I know that they have less white on them and there are smaller, denser patches of colors).