This was the last time tears were mentioned in the series, so maybe this is important.
Also, dual story.
eeeeeeenteresting
I have the first theory of the book:
Ghid and Tott are the same being that was split in half some time ago. Ghid is the body and Tott is the spirit. The mindless husk of Ghid takes the form of the dreamer Ghids while Tott is without an organic body. Ghid still houses all of the power, but The One To Trust has the knowledge. The dual nature of the book coincides with the dual nature of Ghid/Tott.