If he is contracted to Thurgoona he will struggle to get a clearance as i'd say that they would see him as a required player, plus i am sure they will try and make him honour that contract.
But then again contracts don't seem to be worth the paper they are written on these days to some players.
If he does go to holbrook, he is only entertaining the idea as he has to finish off his apprenticeship and has been offered work there so he can complete it, through the football club, so it does make sense if he does go, either way good luck to him,