I am not the best informed on the leopard complex and my understanding may be out of date, but aren't there at least 2 or 3 genes that determine the pattern?
LP-determines IF there is color but not necessarily how much and controls Varnish, although if homozygous produces white areas with no spots (Few Spot, Snowcap)
PATN1 and PATN2 determine HOW MUCH color is present and thus snow flake, blanket, leopard, near leopard. And in different combinations will produce wildly different results.
I'm sure I don't have a complete understanding of it all, so you can kick me if I'm wrong.