HoDA and The Architect

Mind you they have never categorically confirmed that he was one of the 7 but it just seems certain that he must be. The thing that seems odd now though is how he claimed to know nothing of his origins, like he had suffered from amnesia, whereas Corypheus might have been a bit confused when first released from the Grey Warden prison but he pretty soon got his memory back and knew precisely who he was.

When I read the Canticle of Silence, naming the titles of the various high priests of the old gods, I thought it was rather ironic that the Architect of Beauty was the high priest of Urthemiel and it was through trying to waken his god that the Architect unintentionally started the 5th Blight. However, may be that is how each of the previous ones was woken up, when their high priest sought them out, without perhaps knowing why they were doing it. Corypheus was apparently drawn to the corpse of Dumat, which is how the Grey Wardens managed to capture him, so who is to say he didn't originally awaken Dumat from his prison.

What has always seemed odd to me is that the intelligent darkspawn (former Magisters) were only discovered after the 1st Blight had ended, as though they played no part in the actual fighting, even though it lasted 200 years. So what were they doing between invading the Golden/Black City and confronting the Wardens after the 1st Blight?

Eating one another, presumably, if that dwarven tale is anything to go by! I wonder if we will see the architect again at some point, if he was spared. And considering the soul jumping, even if he wasn't. Didn't much like him myself, despite the cultured civility, which is usually a winning trait to my PC's. I'm kinda hoping the other darkspawn magisters are raving idiots at this point as both the Architect and Cory were abit.. underwhleming.

I think this theory is false.
Corypheus and the Architect are biologically immortal,their bodies do not Age and the same is for their minds and brains,also Corypheus was free for quite a lot of time before he was put into the prison,which you have no way to prove was able to freeze his lifespawn.His Amnesia can have better explanations:
The Architect was lying about not remembering anything simply because he did not wanted for anyone to know about his past,afterall he was hiding the fact that he had found Urthemiel until the Mother forced him to admit that.

The Architect hit his head really hard on the deeproads and so he forgot about his past.

When the writers made DAA they had no idea wheter they wanted for him to be one of the 7 or not,in fact in the calling which is his first appearence he was described as a regular but talking darkspawn emissary and he didn't still had the features with whom was depicted in DAA.

If you've been alive and awake for dozens of lifetimes, isn't it conceivable that you would forget your first one?

Look, do you remember every detail of your childhood? Now imagine if you were alive for a thousand years, living in dark tunnels and surrounded by monsters that communicate with each other via snarls and grunts. No one ever mentions your name or what you did prior to becoming a darkspawn. Isn't it just possible you might forget a few things, even if they were fairly important?

Also, a key difference between Solas and the Architect is that Solas was asleep for all this time. His mind wandered the Fade, but that's it.

His exact words from Trespasser:

"I lay in dark and dreaming sleep as countless wars and ages passed. I woke still weak a year before I joined you."

The Architect being interested to find the same Old God of whom he was the great priest in Tevinter...it's way to suspicious,I don't think is just a coincidence,I don't think he forgot who he was.

WoT Volume 2 references the titles of the seven high priests who entered the Golden City. Urthemiel's high priest was the Architect of Beauty.

Oyabun is likely correct that when DG wrote The Calling, the Architect was just an intelligent emissary. But by the time of Awakening, they'd clearly settled on the idea that he was one of the Seven, since he looks more human than darkspawn. He even drops the Vestments of Urthemiel when you defeat him.