If he does start then surely he has to take the width and Fati starts to play closer to Lewa and increase threat in box.
Asking him to play behind a touchline winger taking all the width wont suit either of them.
He deserves another chance at starting in a normal setup with a 4-3-3.
With him you can actually possibly have a LW that doesn't hug the touchline as he can overlap and hold width given how explosive he is.