d21lewis -
Microsoft has been granting "increased capacities" to certain developers. Bionic Commando was supposed to have lower rez textures, but MS has allowed for +150mb for Bionic Commando. Soul Calibur can be the same way.
However, on the other hand - Ikaruga, for all of it's sweetness, was under 50mb. Yes, under 50mb.
Back from the dead, I'm afraid.