Khedira's a good player, but he doesn't stand out in anything. Most of the time, he's more or less passive without the ball but okay with it. Then there's the fact he's often injured, so all around that makes it worthwhile to improve upon him imo. He could be a decent bench option however.
I'd prefer if one day we get back to the level our midfield was when we had Vidal, Pogba, Marchisio and Pirlo all together. World class midfield.