Power in persuasion via personal bane?
Technically we don’t know for certain that this person was behind all of that, and we don’t know how much of a hand they had in it. They could have just set the wheels in motion or they could have orchestrated the whole thing. Who knows?
All we really know is that they convinced the dredge and Flame to work together. Or supposedly. Nothing really says that the “city person” was the personal nemesis.
Stop treating GW2 as a single story. Each Season and expansion should be their own story.
I got the impression that whoever was working behind the scenes here was basically offering certain factions an opportunity to profit. Particularly with the Molten Alliance, it seemed to be a case of convincing two factions to start something for their own benefit, which might serve our mystery instigator in the long-run (whether through general destabilisation of the major races, or something more specific, I don’t know). I know less about the Aetherblade situation, but the trick seems to be to push groups into taking somewhat rash actions that are consistent with their own goals, but are maybe more ambitious or extreme than they would have been without that push.
So my money’s on more of a silver-tongued strategy, manipulating from the shadows. This is living story, after all; politics is half of it, everywhere!