It is not bull. It is true that animals that are het for certain genes are often brighter than their non-het counterparts. Same can be true of patterns. Some genes in the het condition will disrupt the pattern such as train tracks for het pied, and extra white edging on the alien heads for het clown. It isn't 100% of the time defenite, but it is often enough that it is looked for when selecting from possible hets.
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