This may very well be true however it is a very confusing subject as to where the Dragonborn goes due to us never seeing the official death of our characters. However, the Greybeards mention that the Dragonborn is sent by the gods, the Aedra, in great times of need. Arngeir mentions of Kynareth giving the gift of the voice, while Akatosh gives the gift of a dragon soul and dragon blood, thus giving the Dragonborn the inborn ability to learn a dragons knowledge when slain. This by itself states directly that the Dragonborn is a god/ divine him/herself. Now with the daedra, they seem to think to claim your soul however, there may be a minor detail in this I don't think anyone has ever thought to understand. When a dragon is slain by another dragon, or Dragonborn, they receive their soul and knowledge, and it is the only TRUE way to kill a dragon. The Dragonborn's soul can only be claimed if he/she IS SLAIN by a daedra. HAHA you daedric bastards, you do not realize this because you are foolish (this includes Nocturnal and a "contract"). Because the Dragonborn is a creation of Kynareth and Akatosh, you ascend to the heavens, where I believe they give the choice of which afterlife you would want. You may be the first Khajiit to be in Sovangarde, who knows?