After the win over Luton Town on Wednesday, Kai Havertz has now achieved one thing as an Arsenal player that he never managed at Chelsea. Kai Havertz has grown into the Arsenal team this season. The Gunners paid £65 million to prise Havertz away from Chelsea in the recent summer transfer window. Upon his arrival at the Emirates Stadium, he looked to be desperately short of confidence and he did not look comfortable in Mikel Arteta’s tactical system. Havertz came in for plenty of criticism early on in his Arsenal career. However, as the campaign has progressed, he has slowly played his way into…