I completely agree that this is the right personnel but I would change the formation and would move this group of players back to a 4-4-2 with Kante and Mount in the middle (although I do think Kovacic at his best might be the right partner to Kante) and Pulisic and CHO keeping wide and then Havertz playing the 10 role to Werner at 9.

I can't help but feel that we don't have the players to play 4-3-3 properly, we need more in the centre of the park (as you suggest) but none of our strikers are good enough to play by themselves so it has to be time for a pair of strikers and to see if they can cause enough trouble to force others to change. Formations seem to go in cycles and this squad is not cut out for 4-3-3.