They re-purposed some content they couldn't finish for DLC
Even they have said clearly some of this unfinished content is already on Disk, but that unfinished content will get updated once the DLC / Patch goes out
Why is it hard to believe there is lot of unfinished locked content on the original release, when so much of the unlocked content at release still has severe bugs/glitches etc?
They aren't just flipping switch to unlock the DLCs. They have to try and polish it up first.