Barella is used to playing in a very advanced position, like Nainggolan does for us. He is always looking for spaces to get in or shoot around the box. Though I think he is better suited in a more b2b position where he can make those runs.
Brozovic is also suited for a similar role. The fact that we was playing as our deepest midfielder throughout, meant that he couldn't get much forward or shoot with the frequency that Vecino or Nainggolan did. If Sensi takes that role, then we should see more of this.
But in my opinion, we need another midfielder for that more advanced position. And looking at Conte style, someone like SMS would be that MF.