I worry about his speed, defensive pressure and fight but I think perhaps this more to do with his overall fitness and understanding of the game more than any incorrectable flaw in his makeup. He is still very young but unfortunately for him, other talls are making quicker progress than he is. Given the new Substitution rule, Postie will be competing with Vickery, Browne and Derickx for the same position as 3rd tall forward/relieving ruckman so he will have his work cut out. He will have to prove his additional worth as a forward over the others because you would imagine the players mentioned would clearly have the edge on him during ruck duels.
A wish him all the best but I think Vickery may have the edge on him in terms of agility and pace at this stage.
Stripes