I will agree with that. Case in point. This is my big granite male, Bryan. Clearly not the best granite you'll see out there (but he's my baby so don't say a word lol j/k)
However, he produced this granite offspring, Ace, who is one of the prettiest balls I've seen in person.
So based on that experience, I would have to agree that even though it may be unlikely, a lower quality individual can potentially produce a stunner of an offspring.