Gaider explained long ago that what Morrigan reveal there isn't the total picture and that those info are incomplete,you don't know the game better than him since he wrote the whole concept.
He's also been wrong about his own lore in the past. That's why I disregard what he says about the lore. All that matters is the canon. As for what he said about the Dark Ritual, he didn't reveal what is involved every step of the way. So that means he didn't confirm your theory. I am merely posting what the canon states.
The child is tainted understood?It is infected with the taint.
No evidence of that.
Yes non GW killed Dumat and they were not even able to sense his soul when he was killed.
Nothing of Dumat's non-Warden death was revealed in detail, except that people saw him rise again in one of the nearby darkspawn.
They can perceive it when the archdemon is killed non GW can't and those are all info on the codex of Dumat in DAO.
I don't remember anything like that, but so what if they can sense the soul? That doesn't mean it flows into the Warden who strikes the final blow if the Dark Ritual was performed.
The DR work if and only if a GW kill the archdemon otherwise that soul go to a darkspawns can't help you more than the DAO ending where non GW aren't permitted by the writers to kill the AD
We have never seen a non-Warden kill an Archdemon with or without the Dark Ritual, so your claim is unsubstantiated.
It is found during the Dark Epiphany quest. I believe it is only available if you let Avernus live in DA: Awakening.
Avernus is in Origins, in the Soldier's Peak DLC.
How exactly is it not relevant? It is stated quite clearly that the research could directly benefit the Wardens. Yes, the Taint does kill Wardens, that is why there is research being done. The Calling refers to more than just the Song but the end process of a Warden transforming into a Ghoul. If the Taint can be controlled or manipulated then the Calling could be indefinitely delayed. The phrase "Cure the Calling" is not an accident, a mistake or code it is intentional and this story line has been intentionally inching forward for years.
Awakening is not relevant because that is Origin's expansion. Judging by your above comment, you seem to be mixing up the Soldier's Peak DLC with the Awakening expansion pack. Soldier's Peak featured Avernus, Awakening featured the Architect and his version of the Joining to awaken the darkspawn.
The Calling refers to the sound a Warden starts to hear when the taint starts taking over the mind and body. It is the alarm that lets the Warden know that his time is coming. So instead of remain on the surface and become a danger to those around him or her, the Warden goes into the Deep Roads to kill as many darkspawn as possible, and die doing so. The Calling does not transform the Warden into a ghoul. The taint does. And yes, controlling the taint would delay or eliminate the Calling completely because the taint would never overtake the Warden's mind or body.
Again, The Warden has been personally involved since the discovery of the research, they are in personal contact with the First Warden on the issue and then go on a quest to Cure the CALLING. It is all clearly connected. Curing the Taint itself has never been a stated goal but the groundwork for Curing the Calling, manipulating/controlling the Taint and making Wardens stronger and no longer having to fear a premature death via the Taint has been laid.
No. Eliminating the Calling is just a side effect of curing the taint. Delaying or subverting the Calling is the effect of controlling the spread of the taint.
The taint doesn't give them any power except immunity and sensing darkspawn (Getting more than that out of it was Avernus' whole purpose).
Surviving the Joining awards one skill point.