Would it have been so hard for there to be a cutscene at some point in E6 if you unlock Slade, in which Rhue and Slade talk about Serena, or Rhue just mentions Serena, and we're given a big enough connection for one less part of the plot to be as opaque as about 50% or so of it is right now?
Well that would've been nice, except Slade doesn't talk at all in Ep6.