I'd be willing to bet a substantial wager with anyone who's keen on that sort of thing that this is part of a multi-allelic system just like we've seen with Ball pythons. I would venture to guess that the matriarch and patriarch Platinums were the Visual Hets for 2 compatible strains of leukism which produce two different phenotypes in their homozygous genotype. One strain being the ultra line, the other being the abu line. The two crossed together in their het form would make the in-between homozygous phenotype (ivory).

The founding Ivory stock which was crossed back to founding Platinum stock was likely bred to animals simply heterozygous for the Ultra phenotype, which is why those two phenotypes were created.

This would explain why the three phenotypes were express when the ivory x ivory breedings were done by both kevin & prehistoric pets.

This would also explain why the mitotic transfer done with the ivory x albino tiger breeding fruited a white leucistic rather than an ivory when it was genotypically heterozygous while phenotypically homozygous- because it only got one gene from the parent- the white one!

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