Arsenal icon Thierry Henry and Liverpool legend Jamie Carragher both felt the same way about a legendary accomplishment that former Manchester United manager Sir Alex Ferguson achieved. Considered one of the best managers of all time, Sir Alex Ferguson bowed out of Old Trafford for the last time as Manchester United head coach in 2013. The legendary 82-year-old ex-United boss led the Red Devils to their 13th Premier League title – and his last – under his illustrious 26-year reign at Old Trafford. United have struggled in the aftermath of the Ferguson era, with the Red Devils not lifting the l…