Exactly, as anubis1970 commented under your comment, I have never done Duncan's quest, I only did the quest of the other three guilds in the mayor's quest. But the point here is that this can be considered an oversight by the developer that "breaks" the story into the game's plot. It is not normal for Aire to say that it was saved by the player, when that event never happened because you only did the three quests from the other guilds.True but you will miss out on a good item if you only get 3.