Yes he did miss a lot of chances against City but the difference between Havertz and Gyokeres he was actually getting on the end of chances. If Gyokeres can get on top of defenders he has a chance but otherwise he is marked out of games and offers little to nothing. I do agree Havertz not back to his best which is why he started yesterday and needs to start against Palace.
Last 5 games Gyokeres has 3 goals and Havertz has two, Kai has played less minutes and still not up to scratch so I'm not entirely sure I believe this upward trajectory talk.