So I've desynthed the last two dungeons weaver item drops, and they give both holy ramie thread and chimerical felt.

Also something important I've noticed is that all of the currently available desynthisizable gear has only yielded Battlecraft Demimateria 2 or Fieldcraft Demimateria 2 (etc)

I'm assuming, because this is odd, that there will be gear in the future with much more profitable yields and perhaps a continuation of the "exclusive to desynth" demimateria, or something like it.

They're holding back on the goodies, if all we can get is demimateria 2 right now.
They may just be blocking it's acquisition for the moment like they are with the Materia Tier V's.

That's just how I feel about it.

Also, I have not figured out how to get Thavanarian Silk.