I was thinking along similar lines.
I don't think both Chihiro and Scheduler knew. If they did know, they would have produced another PICA to manage that threat. Even limited to the 10 window, the super seijin would have been the CoGA's trouble shooter. That doid not happen and suggests only one person knew about Nimue and that person did not want to counter Nimue's goal.
Which brings us back to the Visitation, Khody, Scheduler and the SSK. Schueler was the guy the Commodore told and he was not obviously in the Pei camp. He began his 5th column work from within the Temple. He established the Wylsyns as the obvious internal check/balance to keep the Vicarate as honest as possible and gave the Key and the Stone of Scheuler as tools. He used Khody's discovery of the secret as a means to build the SSK as the second arrow in his quiver. That second arrow was to ensure his Visitation happened at a time after Nimue was to have awakened and begun her work.
Whatever disruption Nimue caused could be referred to in his message. The Testimony of Scheuler would under cut the Writ in such a way that would allow Nimue some freedom of action. Unfortunately, Khody also warned Chihiro that the demons managed to get the truth out and that truth might survive in some way. So Chihiro also plans to Return. Not sure when that will be.
That passage you cite strongly suggests to me that the Visitation was not the Nahrmahn plan.
Dilandu wrote:Actually an... interesting possibility. What if the concept of Archangel's return was directly inspired by the knowledge of Nimue's existence? Basically Chihiro and Shueller knew, that time bomb under their scheme is set, but they do not actually knew WHERE. So, after trying & failing to deduce where exactly doctor Pei might hide Nimue's PICA, they settled on returning (somehow) after 1000 years, to check the situation.
This may also explain, why they put so much efforts into the Temple; they wanted to have the operational base to act against possible rogue PICA running around with Federation-level tech.