Thats a nice trainee.. wish I had one of those rookies on my team. If I did I will definitely turn him into a PF. OD is a bit low but one full season on OD later on in his career would make him a great PF. Painful but totally worth it. After that another full season on Passing =P More pain but more rewards hehehe.
Just my cents, I hope you have another 2 trainees to train along side Chris Johnson. Also it is important to try to get Chris Johnson into the U21 team. The extra experience he gets from those games will be invaluable later on when it becomes a factor. So smash those primary skills or do wateva it takes to get him selected.
Good luck with him and will be looking forward to seeing him light it up in the aussie NT team.