As with any double het, don't you have to breed them back to prove them out? Two separate genes, locus, allels, right?
I'll bet there's some stealth breeders out there doing it, but keeping it to themselves. Like I said, it's bound to happen randomly, sooner or later, anyway.

There's still too many other morphs to be created independently and the market has got a lot of room before each independent line is saturated, I guess.
jsc

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