Yes his movement of late has been questionable, he's seemed sluggish and slow to certain shots and his backhand has been dismal. Thankfully his serve has been just marvelous but his second serve has been massacred all two weeks. Should he find his forehand, movement and crisper backhand he will be just fine for the US OPEN; which is a place where he has found his best form and match game.
I believe so too. The surface in USO always brings the best out of him. I almost love watching him there more than Wimbledon.
I guess with his current form of serve, a good forehand and great movement, even with a very mediocre backhand will carry him to the title.
Good luck Roger.