i think this is true.
we have one gene, lets call it scaleless.
and in the heterozygous form it has a few scales missing on the head, lets call it "scaleless head" or "het scaleless". very visual, no guesswork.
and in the homozygous form we have the completely scaleless BP. we could call them "fully scaleless" or "super scaleless" or "OMFG what dark wizardry is that"
seems to be a textbook example of incomplete dominant, or as we say codom.
especially if Brians assessment that scaleless head x scaleless head gives you 25% normals, 50% scaleless head, and 25% full scaleless holds true.