Out of the 15(PL) goals we've scored so far this season only 3 have been scored by a striker ( Anelka )
When you look at it like that, Di Santo would be more than able to match Anelkas return.
Barca are playing Bojan(19) and had him in the squad last season. He's making an impact so far this season and even last season he was getting rave reviews for his performances.
Rooney, Messi, Pato, Nasri, Rakitic, Walcott and Fabregas. First names that come to mind who have been given a chance whilst around a similar age and blossomed at the top.
Why not Di Santo?