I don't think there is a 'like for like' with Van Persie. He might well be the best striker around. Certainly when you consider the fact that he is proven in the league, there is no substitute. And that is the point. Van Persie has already, indirectly, got Man Utd 6 points (or maybe 4). So our chances of finishing above Man Utd with Van Persie, Cazorla+Podolski (you can even take the assumption that we wouldn't have bought Giroud if he was supposedly the replacement) might've been pretty good.
As I say, the club really did sell out by handing him to Man Utd. Should've forced him to stay and a club that had their priorities more aligned with the fans would have made that choice. But it's all done now so
