Cassano to Milan would be a pointless move when they already have Pato, Ibrahimovic and Robinho in the attack, it's calling for trouble because there is a limit to how many cnuts you can have in your team. Ibra, Robinho and him together would be pushing it too far.
Cassano for £0 is a brilliant signing for any club in the world.
In terms of the option of playing 4-3-3, this can be a good move, as both Cassano and Robinho can play wide. You need reserves behind the main guns. Cassano was brilliant last season in Samptdoria only to be benched this season, very strange behavior by both club and player in Genoa. Inzaghi's career might be over, he is 37 and just got a horrible injury. Rumour has it that Cassano was available for free - if so this might be a good move and they will get a excellent replacement, whom might actually be better than Inzaghi. 3 forwards is not enough, what if you get another long term injury? i could say thousands superlatives on Pato, but one of his cons is that he is a bit injury prone. At 28 years old, Cassano might have many years left of his career too, especially if he stays in Italy where he knows the league.
I know I said he would be a bad signing for us earlier this thread, but for free that might be another story - he is less of a gamble then. I doubt he is a candidate for us anyway, but for example for Liverpool he would be a colossal improvement. It is also interesting that Ronaldinho is linked to LA Galaxy, one has to wonder if that could send David Beckham back to AC Milan in some sort of swap deal.