I disagree with your last statement. I do not believe it is the "unwanted" normal offspring but rather the "unwanted" hybrid siblings from the jaguar breeding. Very, and I mean very few people would breed an IJ to a jungle or coastal to an IJ just to do it. But when the jag is thrown in, people think it is acceptable. What is to become of the offspring from such breedings??
As far as the leucy, I seriously doubt a living healthy one will ever be produced. Compare the jag to the spider ball. They are both a co-dom morph with neuro problems. Some worse than others. I believe they are both carriers of a lethal gene and hence no supers. While we have actually witnessed the super form of the jag, the leucy, it has not survived beyond a few hours.