Martin Keown now thinks Mikel Arteta let a “quite remarkable” footballer leave Arsenal. A number of big names have departed the Emirates Stadium under the Spaniard, with the headliners found below. Pierre-Emerick AubameyangMesut OzilAlexandre LacazetteMatteo GuendouziJoe WillockGranit XhakaFolarin BalogunAll of these were necessary departures, and Arteta has mostly been proven right after turning Arsenal into Premier League title challengers with his efforts in north London. However, there is one name – not on the above list – who Martin Keown is now describing as somebody who got away for Ars…