Glen McGowan is a freak athlete. Despite a nagging knee injury, McGowan gets up quickly and he plays hard and aggressively, which showed up in several thunderous dunks today.
The knee injury seems to have limited his ability to create off the dribble. He really only made two legitimate moves, one of which was a light crossover on the baseline that freed him up for takeoff, and the other was a catch underneath the basket where instead of immediately going up, he took a couple steps quickly past the defender to lay it in.
McGowan certainly has the athleticism to play in the NBA, and even to be a dominate defender with time, but as it stands now his outside shot is poor and his lateral quickness has suffered due to his injury. It will be interesting to see how he progresses though and a lot of teams might take a closer look if that shot starts dropping consistently.