AD focused on defense and rebounding would be a scary sight. He'll get more offensive boards and second-chance points if he isn't worried about creating offense and taking jumpers too,
THIS!
The entire reason he ain't a monster on the boards is because his ass is out on the perimeter so often.
I agree-- make the big the third option. Less chance for injury, less pressure, highest upside.
Last thing we need is a Kyrie that isn't content with his role after giving up the farm potentially. AD already here.