Studios store a lot of builds for a lot of different reasons. And generally speaking, in AAA I see PlayStation being the biggest pig so I would wager their PS builds are at least the same size if not larger. People knew and probably raised alarm bells that fell to the wayside because it's easier/cheaper to throw money at storage solutions than it is engineering.
I only skimmed through this; I have no real information on the particular game, but I think the console versions could be much smaller as less duplication is necessary when the hardware is uniform.
