There is still much we don't understand..Unless I'm mistaken and it happens more often than I'll admit there are still things we are finding out about animals that have been around for years...
For instance if Phantom X Phantom = super phantom and Mojo X Phantom = "Mystic Potion" then by the same trait Lesser X Phantom should be a "Mystic potion"..but low and behold it a BEL, other things like why did some of the Lesser Pied's turn out to be BEL but the Mojo Pieds aren't. Why do spider pieds have a totally white body with a colored head? Why are Lesser sibs produced from a Lesser to normal breeding not produce Platty Daddys only Platty sibs bred to Lessers produce Plattys.. Then you get in to the Leopards those things just baffle me. All I'm saying is that the Phantom it seems strange that the Phantom is the only piece of the BEL complex that seems to be missing a corner..
Like was said before I think we'll find that a Mystic potion is a homozygous animal and not a combo of two different genes..
All I'm saying is that I have been to that a breeder bred Phantom to phantom and produce super phantoms and BEL's in the same clutch..Could be a fluke could be more going on in that animal than the general public knows. Could have been a double sired clutch.