I imagine along the path to creating a 5 gene animal you have created every imaginable combination under it. If you made a yellow belly, Mojave, pastel, spider, cinnamon. You would already know how a yellowbelly cinnamon spider looks like, or a pewter bee looks like, or a yellow belly spider mojave. Because chances are he's already produced all of the possible 3 and 4 gene combos before hitting the 5 gene.