Tiny sample size
Also, last year he started out as a positive defender and then was back to his old ways by the time the season wore on
He has all the tools both physically and mentally, it's a question of if his motor can keep up and if he puts the effort in.
I wouldn't be surprised to see him put together a decent defensive season if Kyrie can share enough of the load offensively for him to expend less energy.
To me the racial stuff is bigger than the envelope