I have done business with both David and Brian, and can honestly say, I would only do business with David, again.
That being said, it seems like David and Brian had an agreement where Brian "admitted" that the Spider might not be a Het, and there was a monetary agreement on what Brian would give to David. I do not know if this involved the return of the snake to Brian, or if Brian would actually want the snake back. So, it looks like Brian does owe David whatever was agreed upon, but not followed through on, by Brian.
That being said, I do think there is still the possibility of the snake being a Het. It was never bred to a Visual Ghost, and it has been brought up that there are incompatible lines of Ghost. I think it is easy when you are the buyer of a Het that does not prove out, to want the world for your "lost" income on babies you had envisioned producing. The fact is, a 100%Het bred to a 100% Het could yield zero visual babies. So you really cannot say that a Het to Het breeding would give you this or that, and you lost money here and there on babies you could have produced. If you want to count your money before the eggs hatch, buy visuals. Buying Hets is inheirently risky for both parties.
Yeah, it is no fun for the buyer or seller when a Het does not prove out. But, when is it proven that a Het has proven NOT to be a Het? That could take years. I know a guy who did Het Albino x Het Albino BOAS and got ONE Albino out of 30 plus snakes. If that one Albino was not produced, he would think he got bum Hets.
I think if you respect a breeder enough to spend your hard earned money on a Het animal, if something goes wrong and it does not prove out, respect eachother enough to work out a solution, and know that accidents happen, and nobody was out to screw anyone.