The Blue-Eyed Leucistic Ball Python

[asplundii]

but by definition, if it has a pattern and xanthiphore and melanin, it cannot be a lucy. A patternless white snake, whether it has a "dirty" head or not, is leucistic.

And yet the dirty head of a super mojo is the result of the presence of melanin, so your argument falls apart... And even the cleanest BluELs can have a faint pattern to them. So, by your definition, neither of those are BluELs

And, somewhat tangential, the super fire/sulfur has yellow blotching and yet we still call them luecies...