My question is if it only took 1 week to create all that stuff what is the excuse for it not already being in game?
The stuff was done over a week. IT takes a lot longer for optimization in the case of the graphical features we saw and just as long for other stuff to be balanced and properly implemented (Hence why early reports of Horse Combat are that it''s clunky and awkward).
Answer: Deadline forced them to work on the main game and I've heard features are on disk but locked off because they would crash the game.
Why I ask if I know the answer? To make a point.
Unless you have actual proof than that is just your opinion. And it's the same one that gets rolled out for every additional feature that ever got added by a DLC for any game. (And that was only true in the case of the Resident Evil 5 Multiplayer DLC)
Also if said features were on the disks, somebody would have found proof by now. Either via the CK since they'd be within the game files themselves or because some users have other reasons for digging through disc data.