The pastel is there no question. But what else?
He really doesn't have much resemblance to the WOBP trick pictures. Not even the morph tricks. His pattern isn't crazy enough.
I'm going out on a limb here, and say that is a pastel het pied. If one parent is 50% het pied, it is possible he carries the gene. And, I do know that every now and then, the het pied gene can really pay havoc with a morph.
Gale