What is Leonardo missing at Milan?

For 67M E Kaka wasn't sold cheaply; I'd say it's just about right for him. They missing way more than just Kaka, they need full backs as Zambrotta and Janvo are Grandpops, they need a strong guy up front to support Pato (Hunter doesn't appear to be that guy and Inzaghi is well....old) and they need a midfielder that would inject speed and creativity like Hernanes from Sao Paulo.