Okay! I'll go ahead and type up some of the theories here. It is mostly centered around the connection between the Elven Pantheon and the Old Gods, plus a possible Maker, and identity of Mythal's betrayer. I'll likely just copy and paste some of my posts from the other threads, so it may seem a little out of context, and probably realllly long. But, hopefully you guys may be able to add something to it.
I took a quick look and the first off the bat that caught my eye is Andraste as an old god baby.
I agree and have said the same thing before, though I'm not entirely sure about Dumat=Mythal. I do know that for Morrigan to have learned this ritual though, someone would need to have performed it before, and the elves contributed knowledge to the grey warden ritual from what they had left from Ancient Arlathan... So Flemeth is the obvious one responsible for teaching Morrigan this ritual, which has interesting implications.
Also, Andraste's tale matches up well with Kieran. They both had "troubling dreams", but of course, Andraste was the one claiming it was the "Maker".
And the whispers and being spoken to, all that aligns with what Kieran said (am I spelling that boy's name right?) It aligns with what Corypheus said, it aligns with the whispers we hear after drinking the well, and it aligns with the whispers we hear in Origins when darkspawn suddenly pop up, not to mention grey wardens that said they heard this sort of thing too.