Kid needs:
Playing Time
Exposure
New Environment
You don't go from where he was at the end of 2011 to where he is now without the issue being mental, he didn't injure himself (that I know of) so I can only see this as being a mental block.
Send him anywhere, just get him minutes on any first team.
Heck, send him to NZ with Brockie, he would be a stud there on and off the pitch.