Sounds like an interesting project. I hope more information is forthcoming with more breeding.

According to the original post, there were three matings:
1. Bradford Cole cinnamon x blackback female. Most babies were aurora. (Cinnamon and blackback mutant genes in babies disregarded.)
2. brother x sister, both aurora, produced all aurora babies. How many?
3. son (aurora) x mother produced dead embryos.

If this information is wrong, please correct it.

The second mating inclines me toward the belief that aurora is a recessive mutant gene. But it could have been the luck of the draw so does not rule out the chance that aurora is a dominant or codominant mutant gene.

Outbreeding to an unrelated snake is the only way to tell which it is. If a dominant or codominant mutant gene, then aurora x normal would be expected to produce 1/2 aurora and 1/2 normal. If a recessive mutant gene, then none of the babies would be expected to be aurora.

Good luck to you and the guys at Mad Men Morphs.