Love this theory, especially with kelsier and the ghostbloods - maybe ishar having a way to bring the cognitive into the physical is going to have an impact with kelsier considering he is so tied to Scadrial, and is actively looking for a way (through the ghostbloods) to leave Scadrial, which is one of the reasons he is so interested in the heralds in the first place (as they have a similar affliction except with Roshar) [RoW Ch 13, 82, 115]