The New Amendment of the breed standard includes a more Bullier structured dog somewhat similarities to the Old American Extreme Bully Class (which was later removed) for the New American Standard Bully Class and American Pocket Bully Class (except height). The Old American Standard Bully Class is now transition to the New American Classic Bully Class. These new standard is evolving as the Breed become more Bullier and to distinguish the American Bully from the AmBully. Source Reference ABKC
This is just a guide set out by the ABKC Registry what they believe the future breed standards for the American Bully.
Since the breed is such a new Breed and is still in their infancy, there are many challengers breeders face with minor flaws and imperfections. This does not mean the dog is any less or more an American Bully as long as these flaws does not constitute to poor quality of life.