I believe there are many indicators of potential, ability and expectations from an early age. If he's hot as a pup, he's usually hot as an adult. Only time I see it not being indicative is the slow starter turning out good.

When puppies will literally kill one another 10 weeks of age, I believe, 100%, they will kill later on.

Two very very prominant Tx breeders were visiting one day. One was watching a litter of pups "play" that the other one had bred. He warned him if he didn't take that ball out of their pen, they would probably end up hurting each other over it. His reply - "There's not a ball in there".....Turned out to be the head of another pup. They were 9 weeks old. Entire litter turned out to be quite special.

Terrible story I know. Point is, they turned out how they started.

Lots of variables to consider as well. Who is raising the pups, stimuli, development, overall health, their comfort level, etc.