Kai Havertz has now truly established himself at Arsenal. Arsenal signed Kai Havertz from Chelsea last summer, and he arrived at the Emirates Stadium under something of a cloud. The German had never been able to consistently impress in his time at Chelsea, and looked bereft of confidence when he first came to North London. Havertz was called the worst signing of the summer by some. Mikel Arteta clearly saw something in Havertz, but the 25-year-old did not hit the ground running for the Gunners. Arteta tried to reinvent Havertz as a midfielder, but the player never looked especially comfortable…