Song and Arteta looks a good partnership for Wilshere to come in alongside. Balance in CM is very important. Arteta's lack of real quality is still likely to compromise him against very good teams, but it's noticeable that he is genuinely good at what he does (even if limited). You don't need to drag out desperate Denilson stats to justify his contribution. It's a nice midfield to have, with no passenger - Song has 10 league assists this season, and many of them were quality curved passes over the top. Can't understate Rosicky's contribution, but he is ageing and Wilshere on last year's form will make things even better and help us against better CMs. Let's hope he isn't dead eh.