Yes, I improved the name of the thread and put it in the proper forum category, but this is a sequel to, "http://www.gamesas.com/topic/1488341-its-about-time-we-killed-a-daedric-prince/"
To continue the discussion: (in reply to MK-{Omega-X} apparently the 624th person called, "MK" .)
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Now, about your question, I do believe the provided passage is still relevant to this day, (after all, the book obviously wasn't written in the Dawn Era).
It is true that Et'ada created their realms, I certainly doubt that their, "complete control" is much more than political force or exaggerated strength. Here's another piece of text I've probably already brought to this argument:
http://www.imperial-library.info/content/nu-mantia-intercept-letter-7
http://www.imperial-library.info/content/nu-mantia-intercept-letter-7
http://www.imperial-library.info/content/nu-mantia-intercept-letter-7
http://www.imperial-library.info/content/nu-mantia-intercept-letter-7
This text tells us, (at least as I view it) that daedric realm are little more than intentional outer realms, brilliant architectural masterpieces, if you will.
And with this in mind, we can recall that no one seems to be able to control outer realms themselves, or the Mundus for that matter.
Besides, (within my knowledge) we've never observed a daedroth exercise this complete power, even when it would have been practical.