#2 Allowing full backs to maraud forward at will
From Sir Matt Busby to Sir Alex Ferguson, everyone followed the Manchester United's tradition of playing with flying full backs at both the flanks. The likes of Gary Neville, Evra always provided the width which made life miserable for the defending side.
Under Jose Mourinho, players like Ashley Young, Antonio Valencia didn't move forward freely as they were instructed to stop the opposition wingers first from scoring. It somewhat took away the attacking part of their game and narrowed the dimensions of United's attack.
The caretaker boss, Ole Gunnar pressed the importance of fullbacks from the very first instant. Against Cardiff, Young, and Shaw provided width down the flanks allowing the front three to cut back and create more options in the attacking third. Even against Huddersfield, both Shaw and Dalot spent most of their time in the opposition box providing dangerous crosses from both the sides.