For Rio Ferdinand, watching through his fingers during Manchester United’s thrilling 2-2 draw with old adversaries Liverpool on Sunday, there was a worrying sense of Erik ten Hag’s side falling back into old – and rather bad – habits. It was a common theme throughout the first half of the campaign. Rasmus Hojlund stretching the defence, dropping deep, spinning in behind, darting into the channels. Waiting, praying, for a pass which would never come. As the Dane scored in six successive Premier League games before his recent injury absence – becoming the youngest player in the tournament’s hist…