But a Blue-Eyed Leucistic doesn't HAVE to be a homozygous animal.

It can be het Mojave, het Lesser - it's heterozygous for two different alleles, even if there's no "normal-wildtype" gene at the locus.

I would like to see a citation for a visual normal animal that is heterozygous for a gene that will produce Blue-eyed Leucistics... that sounds interesting!