I'm a little unclear on the question too but I have seen triple hets available already and there is no reason someone couldn't produce quadruple hets already if they just had the balls for it (like a hypo piebald to a snow). I think most people are scared off by the long odds of hitting a triple (1 in 64) or quadruple (1 in 256) homozygous animal from a pair of triple or quadruple hets but I think the clutch variety would be an end unto it's self. If I win the lotto I'm definitely getting a pair of complimenting double homozygous (for example albino stripe and true ghost) and making some quadruple hets!