Wenger's the one who's been encouraging Theo to change his style of play. In some interviews, I've heard Theo say he's studying Ljungberg videos and remember constantly talking up his off the ball movement and even saying he's better at it than Messi. Some examples below.
http://www.arsenal.com/news/news-arc...head-of-messsi
http://www.mirror.co.uk/sport/footba...alcott-5118032
http://www.telegraph.co.uk/sport/foo...ilverware.html
When Theo was younger he'd hug the byline, play from deep and keep having a go at our opponents wingbacks no matter how many times he'd get clattered. Since Theo wants top be a striker and not a winger, I'm guessing playing on the shoulder of defenders wide is some sort of compromise. His goal tally has shot up since. 21 goals in 2012/13 is something else. How can you not want that sort of fire power in the line up? Ox can be a handful when playing well but I can't say he offers much more.
No idea why Wenger hasn't implemented a two striker system yet because it's not as if we're getting the very best out of our 3 man midfield. But either way, I think Theo would be smart to move on because he's been ushered down this wide forward path when he should have been developed as a striker. It's like Wenger has built him up for for this special custom made role but now has no use for him.