I was thinking about that. They arent as closely related. And as a result the hybriid being sterile is a very real possibility. But there is the link of carpet pythons. Even if one was completely unsuccessful breeding a pure GTP to a pure ball, they may be able to be combined using carpets as a catalyst. Lets say you attempted to breed a Carpandros with a carpall. Now, im no expert, and this is going on my basic understanding of breeding and genetics, but even though you would never really get a what a pure GTP X Ball hybrid would be like, it would allow the two species genetics to mingle, and with selective breeding you could wind up with a snake that would be the closet thing to that hybrid. I dont really see the carpet genetics really adding anything new to the mix except maybe some cool patterns, but It was fun to think about XD