Agree, and if there is something the Inzaghi's is good at, then it is scoring lots of goals! ;), he is a player who could step smoothly in when Trez gets injuried, wouldnt even have to change the system/style/formation.
Dont forget Inzaghi in CL, he scored several times, he is a good player, a perfect backup for Trez, and i think he would accept the backup role gladly.