-snip- It was a very smart move taken by AC Milan's management. -snip-
It is too early to conclude a smart move or not about signing a contract with Zlatan. He just played a few matches and seemed not really presenting big influences to the team. Let's see till the end of the season to conclude it. 
-snip- They took Ibra to raise the morale of other players -snip-
Agree. One of the purpose is to make the morale of Milan's team be stronger and have a winner mentality in each match. We can see from the last few matches that Milan can be the winner and the team looked more solid and confident.