I have addressed all I need to address as far as the potential for hybrid. Just take a look at some of the African cichlids currently on the market - all popping up at around the same time - in ponds in FL. Albinos, OB's, you name it. I know one of the breeders that created a few strains of these fish, and they all breed pure amigo. There are numerous examples. And today there is no debate as to their origin.
As much as I have always leaned towards te EBJD being pure, there is a side to me that does so with great caution.
1. The original spawns came from a pair of fish that came from a "friend" - 2. both fish from this lucky pair just happened to carry this recessive color gene - 3. the owner just happened to be involved in breeding & showing fish on a commercial basis - which he later sold to distributors in SA, and later when the internet progressed to importers in NA - 4. a business that his son carried on for many years, possibly still does today.
Maybe it was just luck of the draw, or maybe these guys knew exactly what they were doing.
There are a LOT of fish besides Flowerhorn that have come out of Taiwan, China, Bangkok, Singapore, etc - that to date no one besides the breeder knows how they were created. Many are still being produced. In the fish biz the quest for something new never ends.