As I said, you have no clue what you are talking about, you just want to complain for the sake of complaining.
Fact of the matter is Zaza to West Ham was just a random and desperate move by them, for failing to get other targets (Batushayi etc) so they settled for quantity quickly and hoped he would be able to lead their attack. Who the fuck is suprised it didnt work out. Just youtubing randomly of him and West Ham, this guy puts it perfectly after 1.30 minutes in: