The defenders are talking about the dexterity necessary to kill in such a short time (and, should we add, leave no DNA?). RA can be playing pool, anyone can play pool, big deal. We don't know how well he played. What we heard was that RA was drunk on MHB and I doubt that he did have the physical prowess to do it alone.
Furthermore. There were a lot of potential pois, basically, everyone living on that drive plus every young curly white male in the neighborhood. About one of them, 6'2" or so, I immediately felt, no, just look at his legs, he has colossal legs and the BG has rather skinny legs. RA had pretty hefty legs two years ago, too. And, he is beyond their lowest limit, sorry.