I beleive you hit the nail on the head in your post. Basically, the dominant version of the gene pair that makes a Mojave/Fire/Lesser/Whatever causes a predictable form of reduction in pigmentation.

So it makes sense that if one allele would cause a reduction in some/all pigmentation, then a double-dose of this would cause a complete or near-to-complete lack of pigmentation.
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1.0 normal ball python
0.1 greyband hybrid kingsnake
0.2 crazy cats
1.0 husband

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