I wonder if Zahel will play a bigger role moving forward. I believe Zahel is Vasher, there are a lot of references to it. In his interlude, he talks about color, he makes metaphors no one understands, and it mentions how he doesn't hear voices anymore.
What brings him to Roshar, why doesn't he have nightblood anymore, and what is his plan? He was definitely willing to mess around with his own planet/land. Why Roshar?