Too many variables if you are talking about a sport of any kind.
There are great coaches, trainers, conditioners (both strength and stamina), managers, promoters, etc, etc.
In bulldogs, there have been legendary conditioners and handlers who just did not breed dogs.
Many great breeders who never conditioned or handled dogs.
Integrity is where you find it and where people invest the most of who they are into what they want to excel in.