Theoretically, just looking at the genetics, the Super Cinny Lesser is gray because it does not have the homozygous leucistic genes, just a heterozygous form. A homozygous leucistic is incapable of having color or pattern.

Also fire is mentioned as a leucistic gene, and it is not. It does not create BELs when mixed with the common leucistic genes and does not create a 100% white snake in it's own homozygous form.