That's Wenger for you.
As i alluded to he should have been a #8 box to box midfielder but Wenger played him wide as he has a obsession with turning natural central midfielders and strikers into wide players,Ljungberg Wiltort Welbeck Ozil Wallcott Ox Ramsay Parlour off the top of my head were all central players before Wenger got hold of them.
I remember Walcott playing CF for England away at Croatia and scoring a fantastic hat trick,he's another player who wenger has destroyed,when walcott did get a run of games at CF he would score goals for fun until Wenger would put him back wide when RVP came back from another injury,the guy was a striker in the mold of Villa and Owen,small nimble quick finisher.
Wenger is a dinosaur and has destroyed 3 fantastic English talents in Wiltshire Ox and Walcott with their development and his poor training methods where training sessions are just not at high intensity for the match day which creates niggling muscles injuries in games,and to top it off his sports science 20 years behind now.
Ox has just turned 24,he still has time to develop into a top player with a manager who seems to be good at that.