IIRC Nabriales was also talking about a key. I think it was either Minfilia or Tupsimati.
Basically it's one of the points that really looks like they were setting up for the Ascians to go a very different direction to where they eventually ended up going – or rather, set a plot hook (without a solid follow-up plan at the time) that should have pointed in a different direction if they'd actually connected to it instead of ignoring it and trying to paint over the gaps.