Would make sense to pair either Bremer or Gatti with someone more inclined to cover. Bremer is at his best when he gets to be aggressive and mark the 9. Gatti is fairly aggressive too and likes stick close. Scalvani seems to be more prone to sweep although he can be aggressive when required to. Same with Pau Torres. I know people like to pair left-footed CB with a right-footed one but I always figured those that prefer to do different things gel quicker and complements each other more. And yes, I am assuming this hybrid 5-backline is temporary because it's not working out. Allegri went for it to stablize our awful defending and since the only one available to play out wide, who he trusted, was ADM since Kostic is bit inept do dribble his man.
When looking up Pau now... I didn't really get it into my thick head yet but Pepe Reina is still with Villareal. Wow.