IMO Pettifer lacks footy smarts.
In terms of footy smarts I refer to awareness, vision, balance, evasiveness and composure. Being able to quickly and instinctlively sum up a pressure situation and quickly solve the problem via being aware of your surroundings, evading a would be tackle, spotting an unmanned teamate and having the balance and skill level to execute the transfer of the football to that teamate. These skills and instincts are god given and are very hard to make drastic improvements in.
IMO Pettifer struggles in this area and this could be the downfall of his AFL carreer unless other aspects of his game are at a more dominant level that would outweigh this apparent lack of footy smarts. The other aspects in Pettifers game that might compensate for this lack of footy smarts are physical presence, accountability, aerial capacity, and precise and penetrating disposal. The only way I can see Pettifer becoming an effective AFL footballer is if he became a strong at the ball and man, tagging type back flanker who can effectively use his frame both in the air and on the ground and who can also use his long penetrating kick to the teams advantage.
He should mould his game to someone like Soloman and Archer, both of whom I consider to not have alot of footy smarts but make up for it in other ways.