to walk around the PizzaPlex and kill more children? per say a worker named Dave. You hear crying children in the walls of the PizzaPlex even before you get Roxy's eyes, and Gregory mentions something about disappearances when you try to leave for the first time.
the "you should fire Dave, he sucks." letter you get in security breach might be important. Game Theory a while back said stuff about Dave from the FNaF Franchise, I think this connects to BurnTrap and the Blob. What if Dave (aka william ) Is using someone else body