I have shown dogs for 2 decades and I'm going to put in my 2 cents about conformation. I do not think Joey truly has a roached back. Any dog can roach up if they are standing with the hind legs too far up under them. Unfortunately, I can't put my hands on Joey and feel his spine myself so I have to go only on the photos provided.
From a show standpoint, Joey does have a bad topline. He has a slight dip behind his withers and too much slope in the croup. This gives the appearance of a roached back. I believe that I could stack Joey in a show pose and get that back leveled out. Skittledoo, didn't you say something one time about visiting Georgia? If you do, perhaps we could meet up and I could try to stack him and see what happens.
Joey has numerous conformation flaws but I think he is probably a purebred from a BYB. I would try to get a PAL from AKC. A dog does not have to be a top quality dog to get a PAL and I see no reason why he would be declined.