Both... he hasn't done squat (I took into account he got a lot of run in preseason too and his shooting was also putrid.) It's not just his defense or lack of rebounding, it's that he's a chucker.. He basically doesn't do anything else but shoot, and he doesn't generate shots for others. He's assisted on his shots by a huge percentage.
But the reason is both, yea, it's still a small sample so maybe his shooting will bounce back, but at the same time, I do not know that he will be more diverse than he's shown though and there is nothing besides shooting that he does well so far, and some nights, not even that.