So, I recently created an account for the Dragon Age fandom because well, it's a favorite of mine. But since I'm currently doing a completionist run of Dragon Age: Inquisition It's natural I have come up with a few theories.
First of all this is filled with spoilers. Stop reading here.
The first thing that I see a lot of people overlooking is Leliana's death in Dragon Age Keep, when you talk to her she mentions dying but I want to bring up what no one else has seemed to bring up: Wynne and Cole, starting with Wynne who has some idea but not an exact measure of being brought back. Cole is a spirit of Compassion and has assumed the form of a human - At the end of DAI Leliana speaks of how she is free until she is needed again implying much like a spirit that she is bound to this world by a cause. Now there are many theories, Andraste, Flemeth, Mythal, The Ashes, but there is a noticable trend outside blood magic that those who die come back as a spirit or someone who takes the form of them i.e the Divine Justinia herself assumes mortal form in the fade during Here Lies the Abyss. Preferably I would like to think Leliana is in the world of being dead - A spirit, Cole is very naive but take someone who is experienced and has a goal, an expert bard and master of espionage. She could be a spirit - And you would never even know. Another thing, notice how gaunt... dare I say 'ghoulish' Leliana looks in the future of Redcliffe, almost like she wasn't human. But that's a small tie at best.
My last theory, albeit with holes here is on Solas - Gathering up 'everything' and I mean 'Everything' he has said throughout DAI and the DLC - Being Fen'harel and the such, the ancient eluvian's of old. Technically, as Mythal or Flemeth would not know but Fen'Harel who has been there since the age of the gods and even interacted - was one like it or not - Solas is the only one in the game of current who would know if the stories of Andraste were true and whether Corypheus was speaking truth on seeing the gods: Because he was alive around that time, even before then, before the Tevinter even claimed all to the point of being there so long ago that he witnessed the civil war of elves. Now, the big hole here is that he could've been sleeping but questionably, if the Herald could find where Andraste has been - Could he not sleep there and find out for himself anyways?