At 28 in a couple of weeks, he is no spring chicken, but almost needs a mentor to go through his entire game and physical aspects. I remember when he was at the Sixers there was talk about his running action which had a lot to do with his height and they were getting human movement experts involved.
He might just need to pop into Uni SA's human movement department and say "where can I improve?" When guys are that tall, there's a lot of stress on the anatomical parts that isn't normally there for someone of "normal" size. That can affect movement, co-ordination and flexibility to a certain degree.
You would think that someone that tall would be an absolute game winner under the right coach.