I'm still the person who thinks Mythal is Dumat as I think her death/ betrayal is a damn good reason to call her the Dragon of Silence. Should she be The Laughing Lady of the Skies, a God who once actively participated in the lives of men who suddenly disappears, and the prayers and offerings to her to fall on seemingly deaf ears.. her evolution into a god/ dragon of silence is a super logical jump. I also find the connection between Andraste's birth, the Death of Dumat, the female-centric bloodline of Andraste, and the implications of Tyrdda Bright-Axe to be such that I can't see Andraste as anything other than an Old God vessel like Kieran. Dragon Age: Origins made it very clear how and under what circumstances that ritual is to be performed.
But I'm also not a believer of the triple threat theory. I think secrets --> mystery is a more natural progression for Dirthamen. Moreover, it also fits with character revealed in Tyrdda. He is ALL about whispering secrets and mysteries in dreams wiser men should ignore. The prevalence of crows in game, the Dirthamen temple mission, the Watcher statue in the Emerald Graves, the impaled Watcher Statue in Mythal's section of the Fade, and the revealing of the Tyrdda epic within this game lead me to see Dirthamen as the next big bad. Which makes sense. Because Razikale is said to be the next Old God in line to become an Archdemon.
Plus, twin soul double dragon blight if Falon'Din were Lusacan and Dirthamen were Razikale. That's the BEST bet of a Blight that could truly break Thedas beyond recovery. Which the sadomasochistic storyteller in me wants SO BAD. You all don't even know.
Again, this is just my opinion from how I've interpreted the Lore, but it is by no means the only way to see or understand it. I have no desire to be confrontational or judge you or your theory personally. Just voicing my personal discrepancies and providing an alternate view point.
Oh no worries about seeming confrontational, I was joking with the "fight me"
Everybody has different match-ups for the Gods. Your theory is also plausible, and reasoned well (and that fight would be sooo rad!)
Like yours, I am attempting to absorb as many different viewpoints on the subject as I can... So I felt guilty about initially resisting madrar's Triple Threat theory, when I should have been more open to it. I am now trying the outfit on, so to speak!
After slotting in Falon'Din for Dumat as outlined by madrar's sequence of events, my reasoning for the rest is simply the Old Gods being the inverted natures of the Elven Pantheon (in that running theme of soul "dualism"):
Elgar'nan = Sun (day), turned night
Andruil = Freedom (as seen in Sera) turned Chaos, as we already know from the tale of her "losing her face" to madness
Ghilan'nain = frankenstein creations, become beauty
Sylaise = warm cinders of a hearth, become raging fire
June = crafted devoted worshippers (dwarves), turned slaves
Razikale = ?
More to work out D: but bedtime for me, good night everybody!