Willian played that inside forward role expertly. Xhaka established his position and allowed the game to flow around him. Elneny was the more mobile of the two CMs.
You’d probably expect Xhaka to sit in slightly more against stronger opposition. You can see that the 2-3-5 in attack is still evident with AMN and Bellerin joining the front 3. Although, as we know Tierney bombs forward to support the attacks when the switch is on to the left flank. His starting position was as a CB, that’s why his average position is shown as one of the 3. Reality is that in the transition AMN is more likely to be one of these 3 players.