I think you need Pastore more than any of the others. It is clear that there is no creativity in your aging midfield. When I have seen your games, creativity has usually come from wide, from Malouda. Apart from that, you don't have a decent play-maker. I thought that was why Ramires was bought, but he is clearly just another work-horse that offers little in terms of creativity. Arsenal's midfield is far superior in terms of creativity.