Zlatan was leaving even if Calciopoli didnt happen. He had regular fights with Moggi. He was the league best player in his first season, but 2nd season struggle he didnt see the club value him as much (contract)so he was openly protesting/petulant in the last months. It got way worse with his playstation boycotts when the Serie B verdict came.
The main thing that changed with Calciopoli was it narrowed down our sellers to Inger, with vulture like price to boot.
Seven is right, Zlatan looks out for nr 1, he never hid that.