Pär Nolio

The good thing about KDB is he can play any role in midfield, and do it with great succes. He's just one of the most naturally gifted players you'll see in the game.
Still prefer him on one of the flanks though, considering his exceptional crossing. He can still come inside and play one of his famous through balls as well. Plenty of options with him, a lot more than any of the other Chelsea midfielders IMO.