You are looking too deep into the analogy as human beings are a total different ball game. MJ is just the parallel to the perfect dog. MJ was also 1 of 5 children I believe... not exactly great numbers but these are humans with many different outlets, outlooks, and desires in life. MJ's children of today just may not be as motivated as a MJ growing up in Wilmington, NC in the 60's n 70's.

but either way, you won't know exactly how things are going to turn out until you do it. There are more than a few ways to breed dogs. As long as you are selecting for the traits you want you should get results eventually. The only way to find out what kind of traits any dog will produce be it great, cold, cur, linebred, scatterbred, is to breed the dog and find out.