A best as in multiple winner, great dog. A personal best can still be very average. This is not personal dedicated to you, but its mostly the people who don't who is staring blind at a pedigree and hyping up the dogs that are behind the sire and dam. While people who do, breed them to other good dogs, keeping the litter, roling and showing each everyone one of them. In the meanwhile this guy is still behind his computer calculating how much times boomerang rom is in his dog peds being happy if 1 or 2 from the litter ends up in working hands.
For myself i don't have a "best", im trying to figure out who is and if in the coming years i find out or even own one at all, i would not mind to breed it to a another "best" with the characteristics i think would be a good adition but who aint got nothing to do with my dog bloodwise.
exactly what Jack said

its an interesting way of thinking, i like the article but again, i like to know what people do if they accualy own that ACE, lol