1. About King Alistair hearing the Calling. Didn't they say only the Wardens in Orlais were hearing it?
3. Well, in my headcanon, while all the stuff with Corypheus was going on, wherever my Warden was at, she was helping protect villages she passed through from demons coming from the rifts for a while, but not entirely stopping her search for the cure to the Calling. I found it down right comical when I talked to Morrigan about HoF and she said something like "This is exactly the type of stuff she would involve herself in, you should contact her ASAP" and I was like, "Yeah, this is the type of stuff I would get involved in!! Where am I??" LOL.
4. Okay, I've seen the Architect brought up a few times, but did everyone forget Avernus? Grey Warden Alistair even mentions him. Avernus is nearly or already over 200 years old. He was alive/born in the Storm Age which is the 7th century, every age is 100 years, and we are now in the Dragon Age 9:41, 9:30 when you meet him in Warden's Keep. I only played that DLC once and have been meaning to replay it so yeah I don't recall very well... but I don't think he ever explains how he's survived that long even though he is a Grey Warden. I think if anything, we just need to get Avernus and the Architect together in one room and see what happens. In fact, there's a codex/letter found on a dead body, in DAII from Avernus.
The limitations put upon my research have greatly hampered progress. With just a few subjects, I could test certain critical hypotheses. However, the information sent about the Architect has proven invaluable to my efforts, and I am pleased to report limited success. As the Architect surmised, considerable untapped power exists within Grey Warden blood. When properly prepared, its effects can be remarkable.
But my research has also revealed some alarming implications, which I've attached in the old Acanthan cipher. I urge you to send this to the First Warden at once.
I will conduct further tests as long as I'm able. My documentation is very thorough—if time finally claims me, others may follow in my footsteps.
No restrictions: The last shipment was quite helpful for my research, Commander. If you could double the supply next time, it would prove most efficacious. Additionally, the information regarding the Architect has proven invaluable—we have made several breakthroughs recently. As the Architect surmised, considerable untapped power exists within Grey Warden blood. When properly prepared, its effects can be remarkable.
Could it be foreshadowing? If alive, does Avernus have a hand in setting out our hero on a quest to the end the Calling? Honestly, given Bioware's track record, I feel like they just threw that WT mission in just so we could hear a little something from our Wardens and letting us know they're still alive and well. I feel like 99% they won't do an actual DLC about it and just write it off in future games, and 1% I believe they will do it if only because of the enormous speculation and fan desire that it will be a DLC. People expected a lot with Kieran, look what happened... nothing. lol
6. Okay, the Warden-Commander title thing... There was one big inconsistency I noticed. Everyone here knows about how if you choose Lord Harrowmont to become Orzammar's king(and not side with Branka), I believe it said he died a few years later, right? I think a few years is at max, 5. Imagine my surprise when I get a War Table mission from him and I'm
All types of confused, and it made me question how far into the future did the Epilogue actually go? 10 years after the end of Origins, and Harrowmont is still alive, I was like wtf... I thought my keep imported wrong or something. But I was actually kind of happy too, because in the Origins epilogue where it said he died, I felt like it was wasted effort putting him on the throne (although I now realize he is a bad king for Orzammar), so I was happy to see he managed 10 years.
So yeah, I was not surprised when the letter at the end was signed Warden-Commander. Why would any of our wardens give up the seat after only 10 years? I'm actually surprised that people are confused by this, I barely even noticed the title lol. Also, a little bit in regards to #2. I thought it strange for the HoF to be missing too. Especially in DA2, when I went to meet King Alistair, at the end of the convo, Teagan says "The Hero of Ferelden should be back in Denerim by now" and Alistair says "Do you always have to be so formal? She has a name, you know." So in my head, Alistair and Teagan know where I am and I'm apparently chilling out in Denerim, especially makes sense since CE Warden. So end of DA2/start of DAI, HoF suddenly disappears... um, wut? Also, in my game, where I romanced King Alistair, I got the Contact HoF mission from Morrigan. How the hell does Morrigan know where I am? I tried to kill her in Witch Hunt...
Also time travel thing. I thought that was immensely stupid because I remember clearly, in DAO or DA2, maybe both, there was a codex that explained there was no such thing as teleportation magic. OH, BUT IT'S OKAY FOR TIME TRAVEL MAGIC TO EXIST, RIGHT?????? I still enjoyed the mission though, especially cuz Dorian... 
Oooh, off topic but it just came to me, that since the Eluvians are now revealed as portals, does that mean Tamlen could be alive somewhere? Just a random thought, probably for another topic though, but my mind wanders a lot...