After an outpour of internet complaints, 2K has responded to the accusation of having the latest "Sinclair Solutions" pack already on the disc. Community Manager, Elizabeth Tobey, had released a statement on the 2K forums stating, "The way our engine and game structure works is that people need to have the exact same content for people to play together. One of the challenges with post launch content for MP is that it can split the player base, and we want to avoid that whenever possible. For this content, creating the DLC package the way we did allowed for us to not split the player base - so whether you purchase the new content or not, you can still play with your friends"
This statement does seem to ring false however, as according to many people online there is a message that comes up that when playing with people who do not have the Sinclair Solutions pack telling them that search results for games will be limited.
Take it as you may, but referring to a pack as DLC usually insinuates that the content is actually downloaded, not unlocked from an already purchased package included on disc. This does spell trouble from a community perspective for 2K and their multiplayer franchises.