The fact that Oubre sees himself as a defense first player is a good thing. Again, this team's recent success is built on defense. Their future success is likely in that direction also. Oubre seems to be defend the 1-4 positions (at least at times) is a real help. That video has him defending IT to Horford and doing it well. If you are going to have multiple players at one position, it might as well be long-armed defensive oriented wings who can shoot the three. Mikal seems to be able to defend the 1-3 position, and JJ has the potential to defend 1-4. Warren can defend 3-4 (in a very average sort of way). Ayton can defend the 4-5 positions and Holmes can too. Melton seems to be showing signs of being able to defend 1-2 and even some smaller 3's in rare instances. That kind of defensive versatility can make a hyper switching defense very effective.
Those are good points, I'd say though JJ 1-3. I really do like Oubre's length.