Parshendi with stormform summoned the everstorm which will be sweeping across the land, correct? What if the everstorm will wake up the parshmen from whatever close to dull or subserviant state they are in, maybe allowing them to find other forms to then call upon the voidbringers? I could be way off, but Jasnah and Shallan seemed to be very concerned about the parshmen - they did not want them to be on the journey to the center of the plains, what was it they were worried about? More than seeing their 'cousins' fighting/dying. I think everyone is so concerned with the Parshendi and their new stormform you may be missing the bigger picture.
Who knows. First time poster. Be kind