Just to add to the Halo thoughts...
Sarah isn't the one that originated the Halo stuff or even the first with it. She simply seems to be the first to focus on it as a project. That being said, I personally acquired 2 random snakes, not from Sarah, that, when bred together produced Halo snows.
We are working together on figuring out whether this is genetic or selective, but that's beside the point. My point is, these could still be "Halos" without having any relation to Sarah's snakes.