No one seems to like the idea of Welbeck up front, but I think he is probably our best option there, allowing Rooney to play AMC. He's obviously not the finished article, but he has an exceptional understanding with Rooney, and offers more than defoe and Bent. Not to mention his blistering pace would stretch defences.
Perhaps, but he'd need to sharpen up his finishing a bit.
Milan's mid with Kaka, Pirlo , Gatusso and whats his face Dutch guy, was completely mental. Not sure whats going on with Kaka now though - its like he faded after most teams switched to 4-2-3-1. Only really shined with the whole late 90s/early 2000 wingless formation.
Injuries, mostly. Sapped his speed and strength. Also you were thinking of Seedorf.