What has Di Natale and Giovinco done to kick Cassano and Balo out of their starting spot? Nothing.
Trust me I'm a Giovinco fan, and I still think Cassano should start.
They work the defence thin, they just need to be better on their finishing. Giovinco and Di Natale can't penetrate the defense well, and they themselves aren't great finishers either. So I would always prefer Cassano - Balotelli.