Khedira, besides the end, was way better for us than Rabiot.
Everyone hated on him because he wasn't Vidal or Marchisio but he did show up and that pairing with Pjanic was very good.
If Rabiot had half of Khedira's football understanding he would be great. Lazy, uninterested, Rabiot is still an ok midfielder. He has all the tools and not enough of the brains.