And I'm sure you're talking about that "witness and transcriber of the events" crap. These whole 2 years ive been on the forum I haven't seen a person ever explain that whole idea clearly enough to create a stable description of how that plays into the Enantiomorph. If YOU know, explain to me how they worked with Wulfharth and Hjalti. Can the author be the witness and transcriber? Then that says they're only 3 people in that Enantiomorph; I recall one explanating stating that there are 4 people involved with regard to the witness/transcriber, so there has to be another person involved in that one.
And while the real life examples, in relation to the "witness and transcriber" crap, are not EXACTLY the same, the fact remains that 2 complete opposites are indeed instrumental to the "mirror-form." The name itself proves that, so I feel my explanation is pretty valid.
edit: Concerning Jyggalag and Sheogorath, seeing as they are indeed opposites (Exactitude and Uncertainty), then they at least need a mentioning? Have you played SI? I haven't even played it and I still know enough to see why Sheog needs mentioning.