Just watched that video. Like Carmen said, that pup definitely doesn't look very engaged with his family. Kind of the opposite of what you'd think of with a ddr dog. Seems a little chunky for a puppy too, but maybe I'm just used to seeing my skinny pup.
When I'm out with my pup, it's kind of the complete opposite of how this dog is acting and it comes natural to him. Eyes always on me. High pack drive. Won't let me out of his sight. LOVES his family - his life revolves around it. Very engaged and waiting for me to throw something or give some command. He'll say a quick hello to a stranger for a second or two if I give him the ok, but basically velcro on me the other 99% of the time.