By James Cormack There may not be a more significant turning point in Premier League history than Sir Alex Ferguson’s retirement. Manchester United were the club while the Scotsman marauded the home dugout at Old Trafford as he led the Red Devils to 13 Premier League titles. Man Utd were the grand institution the rest of the division looked upon with envy. Despite threats emerging via Jack Walker’s cash, Arsene Wenger and Iberian pragmatists, United’s success was sustained during Sir Alex’s reign. His retirement in 2013 left the club entrenched in doubt and unfamiliarity. As a result, the resu…