The fact the revelation about Asmodean was placed in the TOM glossary also speaks against Graendal's return in any major capacity.

I'm pretty sure they would have tweaked our noses by putting in the final clue but refrained from the glossary reveal until AMOL had they could, but as Graendal exits the plot that didn't make sense, so they put it in TOM.

Actually, Brandon wanted to put it in the scene, but earlier he had made a joke they should put it in the glossary, which pleased Harriet, and when the time came Harriet forbade him to put it in the scene.