My problem with Chelsea is that they often play their players out of position with different players playing together while having different ideas and I'm not sure of the last Chelsea coach that have a squad or starting xi, playing in their rightful position and having one specific goal or philosophy, Havertz playing as Centre forward was the height for me, and every Chelsea fans blames a fish for its inability to sing, Mason Mount is just another player that you really can't place a specific attribute to, unlike Havertz who is very technically good player imo, but as No 10, or just behind the striker, while I would rather play Mason Mount as a LM, because he might not be the best individual player, he's a very good team player and players like that really cannot be attributed to just one skillset, but are pivotal to a team's general chemistry. That's why most the new Chelsea signing haven't figure their shit out either, there need to be an adaptive game plan and general structure, not just having 11 players on the field leaving them to just go figure it out themselves.
Thomas Tuchel really did this a whole lot during his stay with the blues, at most to the player Kai Harvertz, playing him ASA false rather than behind those winger's and striker.
He's pacy but not pacy enough to serve as a winger not even as a pure number nine player. I'm sure Mikel Arteta would definitely use him behind the strikers.
Mason Mount also, he was effective but during games you expect him to show up he flops, too much of the criticisms though feommthe Chelsea fans!