Piers Morgan has hailed Kai Havertz for finally getting his Arsenal career truly up and running. Kai Havertz took a while to start proving his worth at Arsenal. Upon arrival at the Emirates Stadium, following his £65 million summer switch from Chelsea, he looked short on confidence. It also took the German a while to adapt to the tactical requests being made of him by Mikel Arteta. Having played primarily as a striker in his time at Stamford Bridge, the Arsenal boss shifted him into a midfield role which he did not look entirely comfortable with at first. At times this season, Havertz has been…