Had the potential to be one of the countries best wingers but his form drastically dropped as soon as he signed for the NRL.
He didn't really get a chance at the Roosters, decided to come back to Wigan but then get the opportunity for the loan move to the Rabbitos and admitted he would have preferred to stay there. So he never actually wanted to come back to Wigan.
When he returned he had lost a lot of speed (Injuries? And bulked up?)
Was making lots of basic errors
Maybe impacted by constant changing Centres who lacked quality?
Possibly reacted negatively / de-motivated to players such as Marshall, Manfredi, Davies getting picked ahead of him?
Looked uninterested at times
I think its just an accumulation of the above.