There is one disturbing similarity between Mandate & Consult, when both factions are driven by irresistable revelation (Seswatha’s Dreams for the first and Inverse Fire for the second). In fact, they even share the same outcome, for remorseless of Quorum members are limited only by their short life-spans (compared to mangaeccans) and overall pettyness (caused by 2-3 hundred years of lull). So, here's a quick crackpot.
When speaking about plans witnin plans, you can always split their viscera between explicit goal, hidden goal and real goal.
What is the explicit goal of the Dreams? To show dreamers both their enemy and it's heavenly danger.
What is the hidden goal? To make dreamers as zealous and persistent as possible, there is a kinda literal convertation of their bittering souls to the world's welfare.
What is the real goal? Here I stand for the Inverse Fire. Like, while nicking the Heron Spear, Seswatha also witnessed the IF, so reliving that Ses experience should count as witnessing the IF by yourself. It's not an easy task, considering Dreams to have a common, rare and exclusive parts, but nonetheless easier than storming Min Uroikas or siding with Consult.
I like this guess mostly becase of a certain promethean motif. A titan (Ses is badass battlemage) sneaking atop mountain of gods (Horns of Golgottherath are towering high) to steal their secret fire and carry it out to the mundanes? Check all three and add a little bonus for the Wall of Torment in Dagliash, where they fixed Ses with nails.
Also, a few questions.
Is it possible to go though the Grasping while being not of a Few? Can a generic mandati heart become a base for a second foundation artifact with diluted properties (so grasped ones will relieve the life of, let's say, Drusas Achamian, who sometime dreams of Seswatha's Apocalypse and mostly never about witnessing IF)? Is there any chance of different outcomes after looking into IF? Could inchoroi and mangaeccans have mistaken and taken a wrong path? Can a mandate adept take a good path and is there a shortest one? What will a duniyain see through the IF?