By Samuel Meade John Barnes believes the likes of Casemiro and Jadon Sancho have struggled due to the lack of “harmony and togetherness” at Manchester United. Both men moved to the Red Devils for big fees but have struggled to deliver consistently, as has Raphael Varane, another expensive acquisition. He and Casemiro arrived from Real Madrid as Champions League winners whilst Sancho had the eyes of Europe on him having excelled at Borussia Dortmund. Sancho’s career has since stalled since clashing with Erik ten Hag, albeit he was by no means producing before that. Casemiro and Varane have both…