We know Fred's role, a little bit..but what is Pogba supposed to be doing?
If the manager has given him a specific role and he's fallen short, then either the manager is at fault for assigning him to that 'role' or Pogba has failed at it. In both cases the manager is at fault because by this stage he ought to know what works and doesn't for these players
From what i'm seeing, the midfield don't know how to take control of a game, don't know how to keep the ball or how to work together except when they're trying to get the ball forward as quick as possible. Basically when they get the ball, they're trying to get away from it as fast as possible. That's what they've been coached to do.
They don't really havy any clue where the ball is supposed to go, other than 'forward, that way' and when they do, it's just a useless quick pass into nothing.
They're badly coached. SAF would have given every one of them a role and if they strayed out of that they'd be out of the team. The only time SAF made exceptions were when he'd signed an expensive player and was being stubborn eg with Veron or Anderson, repeatedly playing them in roles they were rubbish at.