This makes no sense at all.
If Juve are truly serious about Cavani, to the point where they are supposedly sending emissaries to Paris to negotiate, then what would the point be of bringing Zaza on board? Even if Nando leaves, there is no need for a 3rd #9 type striker on this club if Cavani and Morata are already here.
If Tevez somehow leaves after this season, then it behooves Juve to focus more on Berardi than Zaza.