Adding to the Boney quote, the thread put two and two together in Thorgrim's interlude:
The Great Runes of Valaya, the mighty Karak-Runes that had protected the Karaz Ankor from the Wind of Magic since Chaos first came to the world, and the last of the Great Works connected to the Rune of Azamar, were faltering. And when they fell, no Hold could hope to survive even the gentlest Storm of Chaos.
And made the reasonable jump of logic, that the Rites of Valaya are tied to this ancient wonder. If the energy network fails, the rites stop working, and dwarfs that get exposed to the winds start turning to stone. The end.
Karaz Ankor would have to stop interacting with the world.
Or they would have to find another protector, Hashut style, which would also spell the end of Karaz Ankor (this time culturally)
Also, Rereading that chapter again highlighted the importance of getting a Runelord involved. If we tell them what we know about the Network and Thorgrim's actions (i.e. instantly knowing that Vlag was back), they will probably put two and two together, and do some probing.
How do dwarfs feel about possibly rediscovering (rune)lore that is tied to another secret that does not belong to the runesmiths (but the kings)?
The logical conclusion, i think, is that they would realize that the kings' secret was not always secret. At this point my understanding of the dwarf mindset begins to fail...
would they stop searching because if something was made a secret by kings, then it must have a reason... or would they keep searching, but resolve to keep their findings a secret anyway? Or would they obstruct any attempt at finding the secret?
The "good option" is a possible runelords can know the secret, but can't be told the secret by non runesmiths, so it's all right to try to rediscover it independently.
Which makes the Dwarf we want on the Project Thorek, not Kragg. Kragg has more lore, but his knowledge is probably going to die with him.
Edit: Ideally both, but I don't know how to make those two work together outside of battle.