If it wasn't genetic, or it was a chimera (sounds like a mediaval dragon name lol), how would you explain that we see more of them in the YB, Ivories and SuperStripe morphs ?

I think there is something genetic there, not something that can be explained by only 1 gene. I really think there is more and more gene in it. For this, you would need to breed some paradox to paradox and see if more paradox comes in. The problem is that the ball python don't produce that many eggs, making hard to make stats if there is 3 or 4 recessive gene that comes to play here.