This is from out of no where but it is related to the topic.

Leucistic is the end of any combo right? I mean after a snake is all white, what else can you do? If anything else, it wouldn't be a Leucistic. Know what I mean? Like you cant recognize a pied Leucy, and you can't add no color/patterns to a Leucy because that would defeat the purpose of it being a Leucy, and the Leucy gene wouldn't let that happen anyway..

So Leucy is the end of the morph to me, and please correct me if proven otherwise.