How breeding the best to the best can be worse - The Institute of Canine Biology
While interesting for the three examples used, you in almost any situation have to look at the totality of the dog.
How-ever there are certain conditions and they will be breed specific where-in especially with a dominant inheritance pattern of a significantly serious and life threatening disease that this dog just should not be bred at all.
But I think for some breeds we need to keep our gene pool as open as possible and that means for certain not breeding the best to the best, and may mean breeding non champions who has a fault that keeps them out of the ring but in all other ways is good or even very good.
The more we know, the more complex breeding decisions become.