Delpotro is playing loads of doubles at the mo. I do think it improves net play, but the fact that Andy has entered the doubles here makes me think he's not going to be totally gutted if he doesn't win the singles.
Paris is the prize. He's said as much himself, as it's one he's not won.
Playing seems to be helping Andy, however Knowing Andy hates to lose I think he will be going all out to win, also he wants to keep his winning streak going, as well as saying to Fed and Nole this where I am. This would be a very good statement before Paris and the O2 and ultimately before the Aussie GS.