Has a homozygous multi scale even been produced? I could see why people would think that they are in the same complex but imo they are definitely different morphs.
From what you mentioned the heterozygous scaleless head acts as an enhancer. That's the main reason why I like the microscale stuff. I haven't noticed it on the scaleless head animals (although I haven't looked at many) but those microscale are on fire! They also look like they'd have a different texture to them being softer and smoother despite still having scales. Almost akin to a leatherback beardie.
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They are indeed different morphs, much like Fire and Vanilla. Here is a pic belonging to Florida Reptile Ranch on the contrast of SH to non-SH. The non-SH pin on top and SH pin on bottom.