I am no breeder so I can't offer much of an explanation.

Based on personal experience I would say Rocky's bottom half is more impactful than his top half. The Medlin's Outlaw dog, the Whaley dog, Swinson's Carolina Rose, Rex Boy. These were all dogs that rode up and down the road with different people. I am sure those four liked a lot of the same things but still they were different. Even tho it is the same family it is a form of selection, and that selection can provide some hybrid vigor.

It looks pure, or mostly pure, but Rocky is a pretty good blend. If a dog like that performs and then produces, I am not all that surprised.

EWO