I've always thought he should be in a role more central attacking, just behind a striker but we don't really use that role (maybe we should try it). He has probably the best softest touch of anyone on the team (along with Pogba) and he may still be brilliant at that role sitting behind Lukaku and Sanchez with 3 proper midfielders behind him (Fred, Pogba, Lingard, Matic, Herrera) expecting the pacy midfielders will provide some width along with our fullbacks.
I'm uncertain what can actually be the key that unlocks our attack but he has uncanny vision and touch on the ball and his passes that when he touches the ball near the box, it turns into chances more times than not. Compare him on the ball relative to Martial, Rashford etc.. Vision and passing is an enormous deficiency in Martial and less so Rashford. The more I type this, the more I warm to the idea of a 4312 or a diamond midfield. I think Pogba and Sanchez could fill that role as well at the top of the diamond. We could use that creativity up front to provide service to our finishers. It could be a style all our own with the pieces that we have... I could really see this fitting.