I wouldn't say its the het's alone, but also the selective breeding that went into previous generations.
The intensity of any given morph is a poly-genetic trait, there are millions of genes in the background effecting the quality of any given specimen of a particular morph.
So if a lavender pied that has been selectively bred over several generations for the highest intensity color saturation produces a normal offspring, that normal will likely look much different than a wild type because it has still inherited the linebred traits for intense colors.
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