In ball pythons there are only a handful of documented Polygenic traits, this is the only one we are pretty confident on what’s going on… I dumped the job of the other Poly ones (mainly Fader) onto Travis 
So the Glossary may help here.
Yep…
- Fader (a colour reducer?)
- Genetic Black Back
- Brown Back
- genetic chaining (alien heads frequently merging), high blushing, genetic banding (not to be confused with Genetic Banded which is dominant)…
It is certainly reduced pattern, whether genetic in any way would need proving through breeding projects or past data on the parents.