Milan is like every other team before them who have stacked the forward line with talent without balance in their team. They win against smaller teams by individual efforts from these players but struggle against big teams.
That's why i don't get why the hell they would buy Cassano when attack is the least of their worries. If Serie A was even a little bit more competitive this season they would have no chance. Now the level of big teams in Serie A is alltime low so most of the other teams struggle to win against smaller teams. That's why Milan may well win the Scudetto this year just by beating these small teams.