Yeah, IIRC, the video showed a few clips of him guarding the rim, but most of those "highlight" videos are offensive plays.But can he play defense? The video I saw of him was all offense. Maybe there’s another.
But, in answer to your question, he's a seven footer. That makes up for a lot of other weaknesses. He looks pretty skinny, so he could use some lbs., but 7 footers don't grow on trees. Especially the kind that can shoot the 3 and put the ball on the floor.