While your description is possible I don't think it's the only possibility. I don't think it has been proven that the hidden gene has the same locus as the allele causing the mutation. It seems plausible that the hidden gene allele has a different locus but has no phenotype unless it exists in conjunction with another allele at a different locus. The combination of the two different alleles, each with a different locus could have a synergistic effect.
For example, we expect the super woma to be a pearl but that hasn't been happening. NERD appears to have womas that can make pearls and that ability is attributed to a hidden gene combined with the woma gene. Is it a super woma (the same allele existing on both chromosomes at the same locus) PLUS a different allele at a different locus or is it the combination of the woma allele and the hidden gene at the same locus (one on each chromosome)? I don't know. I don't know if anyone really knows. It's a very cool question and I'll bet most of us wish we had paid a lot closer attention when we took genetics in high school/college. How does the expression go? '...if I knew then what I know now..."
Regards,
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