Many Noch Zugel dogs still have normal, *not displastic* hips into their elder years. Xrays take 3 dimensions to 2 dimensions...much information is lost. If the hip joint has no displasia...no bony changes *and* has limited or no laxity, the score from OFA or a-stamps is a pass. The differences between, excellent, good, fair, normal, fast normal and noch zugel are subjective (opinion).
My noch zugel (age 1), OFA fair (age 5) bitch produced multiple litters and ZERO displasia.
In my experience, any dog with a pass will do well in it's individual lifetime. What the dog produces is another story ;-)