On the
>other, I give him credit for working on his game and physique;
>I do think he has improved. He is a lot more agile than he
>used to be, he can do stuff off the bounce and he overall
>seems more athletic than earlier in his career. He also seems
>to have added *some* range.

He'll never be a plus defender, but if these elements keep improving, he'll stay not just in the league but on the floor.