Now, I wouldn't go full r*tard and claim that Cerci is World Class because he certainly isn't. However, I think that he would improve our starting XI in a 4-3-3 for a number of reasons
First of all, the most logical thing to do is to drop a CB and add in a Winger. So that means bye bye Bonucci. Swapping Bonucci out (Who is sometimes a defensive liability) for a forward who can actually make something positive happen AND we'd finally have 2 men per flank sounds good to me
Secondly, Llorente's scored numerous headers for us already. Despite being lucky if he gets two quality crosses fed to him per game. Cerci is fantastic at crossing and Llorente would benefit from that a LOT.
Also, In Cerci we would finally have a player who's not afraid to run at the opposition, to take his man on and he has the pace to run in behind. Ideally we'd want more than 1 of these players but i'm damn sure that having 1 is better than having none at all.