User blog comment:Blood Reaper/Skyrim Dawnguard Trailer/@comment-4772788-20120531195710/@comment-5060344-20120602224907

We don't know that the Alduin's Wall Prophecy is drawn from a Scroll as it is Akiviri in origin and thus very difficult to find a definite source for. Also, there must be multiple Scrolls involved with The Champion of Cyrodiil, since the Gray Fox one probably didn't refer to the entirety of the Oblivion Crisis, therefore one or more of the other Scrolls must also have been at play.