User blog comment:Powelly619/Burial at Sea - more apperances?/@comment-2019338-20140706102844

I figure they thought they had enough characters appearing already, and chose to stick to those that would let the plot stay focused on Elizabeths story. Other than that, I also think Ken Levine (writer of BioShock and InfiShock) does not regard BioShock 2 as canon, seeing that he had no role in writing it, and Burial at Sea contains no references to BioShock 2 at all, and I think that is a deliberate choice.