That is neat! It is always great to see others surprises and to learn more about blood python morphs! Great job!
I hope it doesn't offend you, but I'd like to float a different theory. I don't know if anerythrism could be a dominant trait. In theory, the enzymes utilized to form the red pigments come from both sets of genes. Even if one is defective, the other one should be able to produce enough red pigment. Therefore, animals heterozygous for the anerythrism trait should look normal. Then again, I've been out of reptiles for a while, and I may need to brush up on what's going on with the paradigm boa constrictors and their genetics.
FWIW, which probably isn't much, here is my theory. I bet that is something like the cinnamon/black pastel ball python- which shows both color and pattern variation. Maybe not exactly like it, but I am looking forward to seeing the homozygous form of your blood python. Wouldn't it be neat if you produced the blood python version of something like the super cinnamon trait in ball pythons? In my mind, I would think such an animal would be more valuable than a dominant form of anerythrism, but I may not have my finger accurately on the pulse of the market.
If we are betting dollars, black pastel blood python is what I want to bet my dollar on.
I hope you don't mind me wildly speculating about YOUR animals. Awesome snake!
Bryant King