Thank you for giving me something to read.
It's a great story, it's a shame that we have to bust our rears to make hide-or-hair of it.
Someone mentioned that the "Twelve" maybe physical manifestations or even may actually BE the people from the Circle of Knowing. I think it's safe to say that at least they're Archons and are closely related. I think Y'shtola's efforts to get the key may have been connected to the release of the primals and the prohibition of their summoning. If it's true that they are closely related to the Twelve then they would have an interest in seeing that the Mother Crystal's aether wasn't consumed by other entities, seeing as summoning "the Twelve" to prevent Dalamud would have consumed as much.
Since they are essentially the "good Primals" (See Thancred's speech on "living on a prayer" about the similarities between the Twelve and the The Primals) and they have "Archons", I think it would be reasonable to speculate that the "Bad Primals" (Ifrit, et al.) would have Archon's (The Paragons) too. That the Primals were locked away and sealed by the Circle of Knowing probably might be an interesting theory too, but I don't really know much about that.
Hydalyn's awakening of the echo would be an appropriate response to a watershed moment that involves her very life. Awakening the Echo may have been an act of self preservation because it basically helped prevent the Circle of Knowing as well as the Ascian's (or their pawns) from fighting directly since you manage to screw over both their plans (Gridania is still a bit shadowy) in all three cities.
As a result, the calling of Dalamud by the Darnus may be an Ascian plot to get rid of The Player specifically and they almost succeed were it not for Louisoux's contingency plan. If Y'shtola time warped to 5 years later in her quest to oppose the Ascian's again, it's likely that she'll be looking specifically for you...
And it's also likely that the Ascian's will be looking for you too.
I'm looking forward to the special cutscene that all the players brought forward will receive.