"Unleashed"? Do you really think that's what would happen if he went to Barcelona? They'd want to sign the Pogba that plays for France, not the one who plays for us every other week. They'd want the same thing Mourinho wants from him... to boss the midfield. I'm a big defender of Paul Pogba and I think some of the negative attention he gets is ridiculous. Saying that, if he goes to Barcelona he's going to have to tackle, to track his runners, to hold a position, to spread the play, and get it to the forward players quickly. Messi is the man at Barcelona, and Pogba, good a player as he is, is not going to change that. Our midfield is often overrun and outfought. It's been everyone else's fault for a while, doesn't seem to matter who plays with him... but at Barcelona he'd absolutely be leashed... because that's what would benefit the team most.
What he would get at Barcelona would be the ability to coast against two-thirds of the league... so he'd only really have to turn up for the big games to be a difference maker. The World Cup showed perfectly what he is capable of in a short run of big games. His performances this season have been good on the whole, but if he'd taken his really big chances this season he could have 7 odd goals already... how much more off the leash can he be without calling him a forward?