
Originally Posted by
Skies
Damielliot does not appear in the Alchemist quests <...> The ALC quests revolve around a sick boy
That sick boy the ALC quest revolves around is named Damielliot. Yes, this is the same Damielliot as is seen collapsing in Calamity Cometh. I believe that truly understanding his role in that quest, as well as the ALC storyline, is immensely helped by looking at the big picture, combining those appearances.
(I've yet to do this; it's on my to-do-when-I-get-there lists)

Originally Posted by
Skies
Crap I DON'T have the text of that adventure saved, argh.
Heeeere you go!

Originally Posted by
S'lyhhia
Was it you who worked this miracle, Forename? I have just heard it from the children─that Damielliot came to whilst you were at his bedside. And that he spoke words of thanks to you─for saving him. There is no reason to suspect that our treatments suddenly started working. I wonder if it was not something within you that roused him from his sleep. Any alchemist who has practiced the healing arts for long enough has seen things like this. Things which can only be described as miracles. You are no less than a hero to the children now, Forename─and to all of us. Miracle or not, I am grateful that you were here. Please, take this─a scarcely adequate token of our immense appreciation.
This is seen as the holy grail of "The Echo can't change the past!" being irrefutably wrong. The thing that gets me is ... Squenix doesn't give one-example hints. In my humble opinion, either this one is being interpreted improperly, or there are plenty of other examples we're just not attributing to our own influence.
My Theory
I'm wondering if what's really going on is that Damielliot has the Echo and doesn't know it or how to control it. You'll recall that before the player masters the echo, they, too, have a tendency to mysteriously pass out a lot. That might be what his sickness really is, and why he responds to the player's presence. Would that not make the dialogue much more in line with what happened? We might not have changed history at all.
Again, I haven't critically analyzed these scenes yet; I could be way off. I have faith that Catapult will nail that idea to the wall if it's wrong, though - so you're in luck!