Dzeko, yes but we wouldn't play the same way if Aguero was here, stats or not. Giroud would be guaranteed to ride the pine most of the time just like Dzeko, a better player, has had to.
Thinking about his weekly cheque is probably the only thing keeping him there.
We, on the other hand, only have Welbeck whose presence has made Giroud buck up his ideas and become more professional as Wenger recently revealed. We are now reaping the benefits of that new attitude so whatever you think of Welbeck, fact is he has improved us in more ways than one as he is 8.5437 times better than Sanogo.