It should help, but I think a lot of that is just down to Mourinho. I mean lets be honest here, could you of seen us playing long ball under pep with the team we had last season?
Pep would of probably used something like a 3 of Herrera/matic, Pogba and Mata. Sure they are not on the level of City's midfield, but if we really wanted to play that kind of game and not long-ball, we could of done it a lot better.
Ultimately what I'm saying is, it's Mourinho DNA to resort to long-ball, so don't expect it to change with Fred!