There seems to be some confusion on what co-dominance is and how it works. We need to keep in mind that the word "super" is not term recognized in genetics. That is just something reptile people made up.

Frank,
Polygenic and co-dominance do not overlap on any spectrum. You can not take a genetic trait and turn it into a co-dom by breeding it.

In simple terms co-dominance acts the same way a recessive gene works only in co-dominance, the heterozygous (gene carrier) form can be distinguished from non-heterozygous animals. What we call the "super form" is the homozygous form.