You don't get assists when nobody converts their chances. The system is rotten, it's not even any use blaming any of the usual suspects anymore. Ozil, Ramsey, Giroud, Gibbs, Per, Flamini, whichever GK...
A system isn't just about formations, either. I don't think that simply playing this player or that player here or there is going to change a damn thing. It might help to put Ramsey back in the middle, and rotate between Caz and Ozil, but unless there is a new manager we're going to be narrow as fuck, transition too slowly, play the ball sideways to look for an opening, lose possession, and get hit on the counter. Also, we aren't suddenly going to be effective in attacking or defending set pieces.