Jesus looks completely off the pace and completely devoid of confidence. He's been awful since returning from injury, but it's not like we haven't seen it with other players.
Martinelli has only started producing in the past week after almost 6 months. Partey likewise has only just started to look sharp after half a year.
Jesus has been replaced by Havertz so he won't get the chance to play himself back into form/fitness and will most likely get injured before then anyway. It's hard to see a way back for him at this point.