The things that need improving are
1. recovery on the ground and speed of reaction when moving to tackle. He is quite good at choosing inventive options for knock ons, so no problem there.
2. positioning for marks, and regaining position when his first move is not the best. If he can make significant gains here, he will be a player.
3. holding the straightforward marks. He still drops too many where he has done all the hard preperatory work.
These are all areas where improvement is possible, and even likely.
Note also that the AFL seldom leaves the rules alone for very long. A change that advantages very tall ruckmen is always a possibility.
Keep.