I was thinking about this yesterday because he seemed far more at ease in a way I hadn't seen for ages. Namely, since Ronald Araújo and Nico de la Cruz got injured for the NT and his passing got instantly poorer in that setting.
Instead of four decent and mobile options in different directions he suddenly had two. I noticed late in the season his exchanges with Dorgu were a car crash/bag of nerves, and had a gut feel he had done better with Casemiro rather than Bruno alongside him (for starters Casemiro being an option = Bruno is another further up) and had a better understanding with Licha behind him than the chopping and changing thereafter.
In a nutshell, he is OK if you give him options, but too limited if his options are obvious and the oppo can act accordingly. With Cunha and a more settled Dorgu and no Bruno as the predictable go-to pass he looked far more comfortable.
Maybe it was just WHU not being at the races, but I refer back to the NT evidence, which is basic common sense: more and better options makes passing easier.