User blog comment:Argorrath/Call of Duty: Ghosts's "Team Leader Pack" and "Ghosts Insignia Pack" revealed/@comment-1055346-20130925153059/@comment-1187559-20130926184822

It's quite clear that after the creation of Skyrim they were aware of what they wanted to add in their DLC. Perhaps it took a bit longer since they wanted to test some new features, but they already knew where they wanted each DLC to go. They didn't release Skyrim them cobble together a story based on new things they wanted to implement.