I know but all the lucy snakes I've seen regardless of morph (fires, lessers, butters, russos, mojaves) can produce pure white snake as well as semi patterned snakes, it all depends on the specimen. You can find patches of patterning, high yellow dorsal striping, greys, purples, blues etc in every lucy form. I think it's along the same lines of pieds being able to produce any range of low-hi white pieds in their offspring regardless of their own patterning.
Also I did notice in another thread that I can not find anymore you were going to the reptile convention here in Sac at the end of the month and go to UCD? What do you study there, my girlfriend is a student there.