User blog comment:Madman97/The Jyggalag Theory and the Elder Scrolls/@comment-1738746-20150514095345/@comment-11345660-20150518002450

As for the first idea, I admit that it makes more sense to have a broad idea of what will happen rather than exact detail, and makes an algorithm for Jyggalag's use much more believable.

As for the second, it brings up interesting ideas for how the scrolls themselves work and what their origins are. There can still be a correlation between mer and Jyggalag that doesn't harm the original theory of Jyggalag penning the Elder Scrolls himself. Many here run around with the idea, including the Mer themselves, that they themselves are the descendents of the Aedra who stayed behind after Lorkhan's creation and after Magnus's exit from Mundus that slowly lost their divinity with each generation. Aedra are more Anuic in nature, and if the Mer are descended from the Aedra, that makes them more Anuic. And considering that Sheogorath himself notes that Jyggalag is more Anuic in nature, there is a direct connection between the two. Moving on...

I don't think writing it all in one place or not affects the outcome of the prophecy. That seems silly. Unless you mean there is less of a chance it will be read. Well, I think at least one of them getting read is a fat chance in and of itself, and he probably didn't want anyone to know what he was up to, so he could have wanted to lengthen the trail so normal scrolls readers would miss it while those who knew what to look for (his vampiric kin) would find it. And writing them across three was probably an act of self-preservation. I have already said that a mere mortal would be hardpressed to read or write in a scroll, but since Vyrthur is Mer and thus have a higher tolerance of its power, he would probably be able to write in one for a brief amount of time before th side effects kick in. There really isn't a question of whether or not he did actually write in them though. Everyone says he did, and its likely he did. There isn't really any reason for him to lie about that.

Logically speaking, theft of Jyggalag's algorithm seems more likely. How could this Mer, vampiric or not, be able to see the future? While vague, there is one specific thing he points out. "In an age of strife, when dragons return to the realms of men." How could he have known that would happen if not for some gift?

As for actual writing in the scrolls, the symbols and whatnot that appear when the dragonborn attempts to read it are probably the product of a mortal mind trying to comprehend a piece of creation itself. Of course we're going to see all kinds of weird stuff, but the Moth Priest who read it for you in the Dawnguard questline said that along with a voice telling him things, there were indeed words. I do agree however, that he probably sees visions and stuff ike that. But I stand by the notion that Vyrthur did indeed write in the scrolls with the (unintentional) help of Jyggalag, and there is hardly evidence that suggests otherwise.