I am pretty sure on the white snake with the pied cross. I guess I just don't see the point in that cross. If you look at a buuter, lesser, and mojave, you can clearly see that the same genetics are at work. If you look at a fire or a Vin Russo het., they don't appear to be compatable either. I don know that Greg Graziani made a lucy with a Vin Russo het to a mojave. I may be wrong, but I have a mojave and a fire in my rack and see nothing alike between either one of those snakes. My true opinion is that a leucistic snake is a dead end visual morph, however if you saw the picture of the fire pastel, which I have seen and held in person, the potential of that morph to brighten everything up is tremendous.
I am just stating an opinion, but why would you try to use the leucistic to take out the color of a pied, when the contrasting colors is what makes the pied what it is.