By Grey Whitebloom For one week in 2018, Jose Mourinho had a second shadow. Hovering behind every move made by the then-Manchester United manager was a freshly retired Portuguese midfielder studying for his coaching badges by the name of Ruben Amorim. The relationship between these compatriots has come full circle following Amorim’s appointment as United’s latest head coach. Much like Mourinho, who established himself as Europe’s most promising young manager thanks to a trophy-laden spell at Porto in the early 2000s, Amorim wooed United with a staggering array of accolades at Sporting CP. Mour…