one example or proof that devs seperate parts of the game for DLC is that in the PC ports (like Transformers Revenge of the fallen PC), you can find files of the DLC in the game files.
I don't see why people are rushing Episode 3 (And some wanting a team fortress 3), I mean good games take time to make, not a freaking sequel every 1 year or 6 months
Kaine852's comments