Ubisoft had plans to include drop-in co-op gameplay in the original Assassin's Creed, but the mode was scrapped because "it didn't fit".
"Before we knew about the Desmond story and Animus link, we had a huge co-op component in there," he told OXM.
"But it just became too hard to do: the engine couldn't support it, and then the metaphor we had above it didn't support it. Co-op was one of those big things at the beginning that just didn't make sense in the end."
He added, "There was no way to reconcile having multiplayer or co-op in an ancestor's memories. Your ancestor lived his life in a certain way, so assuming you had branching storylines, it creates a paradox. It didn't fit."
Episode one of Assassin's Creed 3's DLC the Tyranny of King Washington - entitled 'The Infamy' - will be available on Xbox 360 and PC on February 19 and on PS3 on February 20.