Jack I like that response.
Dogs are individual. I believe you breed traits more than anything else. Sure there are exceptions, but consistently stacking the deck should pay off in the long run. Just because a dog is bred a certain way means nothing if he does not exhibit the traits you desire. I've had friends that say family inbreeding, or linebreeding is how you stay consistent because the dogs will at least be the average of their family. With or without being checked to see if they posses any attributes of a true APBT. I've never desired to be average, and feel all that does is keep names lined up in pedigrees. I always counter with having the ability to orchestrate what I want in an animal and breeding to what I wish to see. That can be achieved by sticking within your family, but you have to seek out the individuals possessing whatever you fancy. Jack you sought to create and maintain a family of head dogs, and accomplished your goal.
[I promise you my own line didn't get to be a high-percentage bloodline of head dogs by NOT breeding to game, talented head dogs

It got that way BY breeding to (and for) game, talented head dogs]

You knew what you wanted and created what you desired by carefully selecting INDIVIDUALS.

HAMMER49