i think he has hinted previously that he likes the 4-3-3. its not surprise when he has so many good young and of course del piero type players to play the roles supporting the main striker. del piero, bojinov, guzman, palladino, sculli to name a few.
also the team must attack and score and win games considering it is 17 points behind.
and last but not least, it is serie B, even with the young names, these players should be good enough to play this formation and win well and dominate.
Zanetti, nedved and marchionni should be able to hold that midfield well regardless.