Although he's done well at Juventus, I think secretly Pogba is pretty frustrated that he's not in a big league already, playing for Madrid, Barca, Bayern or even us, god forbid.
At the moment, he's being priced out of a move and in his quieter moments, this must annoy the hell out of him. His ego demands the big stage. Juventus will always be big, but not big enough for him.
Of course, he said he left for United for playing time but he was just a teenager in a foreign land - and that decision was all to do with Mino Raiola's grand plan. His players are all on the Mino monopoly merry go round and actually never seem to get off, as a tide of speculation swirls around them year after year. Mino plays the system well. I honestly don't think Pogba has a clue what he's doing - or where he's going next.
That said, a nation expects - and Pogba is expected to deliver. He'll be under more pressure this summer than he's ever been. Of course, the boy's got talent but let's see if he can inspire his team to glory. If he does, Mino might combust.