I like to believe, and my impression from reading the lore is, that Akatosh in Oblivion was not Akatosh, but an avatar of Akatosh formed by the will and beliefs of Martin Septim, as well as the other dragonborn souls contained within the Amulet of Kings. When he broke it, it was a combination of their essence, whatever aspect of Akatosh existed within the amulet, and the
idea of Akatosh that manifested as the avatar which defeated Mehrunes Dagon. The "actual" Akatosh - for lack of a better term - to me is far more than a god. It is the avatar of the totality of time and change, encompassing both creation and destruction. The various Daedra may be individual avatars of the various facets thereof, but to me, Akatosh/Alduin is the avatar of the totality of change, in all aspects, both "positive" and "negative" as we perceive them.
As such, I do not believe that Akatosh proper, if you will, has ever truly been seen in a Elder Scrolls game. And I suspect he/she/it will be seen in Skyrim, and will be terrifying to behold. For we will bear witness to that which might consume the world if we fail. I strongly suspect that a lot of Imperial propaganda regarding the Nine Divines, Lorkhan's deeds and affects thoroughout history, the Dragon Break, and what exactly the nature of the "defeat" of the dragons in ancient times that allowed the Empire to flourish really constituted, will come to light and be revealed as truths contrary to what the Empire has led its people to believe for so long. And "defeating" Akatosh again this time - assuming we do and the world doesn't get destroyed literally - may have dire consequences.
The empire already is in tatters. Morrowind has been devastated. Black Marsh is on the move. Skyrim is gripped by Civil War. Forces are at work trying to reestablish the Aldmeri Dominion. Need I go on? It may be possible that only another Dragon Break (this time in the more literal, confrontational sense,) can save Tamriel as we knew it. And that may be what we get if we "defeat" Akatosh again...
hmy: