Kai, possible founder of the Divine Order?
Your basic premise is incorrect. His Divine Shadow always wore a hooded robe (except when transferring essences via the kiss)in the 3 movies. The figure in the painting is not of Kai but His Divine Shadow. If you will remember HDS had an intimate knowledge of “The Dark Zone” which probably means that he visited there a few times and maybe was defeated a time or two and therefore decided that it was the universe of chaos and depravity because of his inability to gain a stronghold there. (Who here doesn’t think HDS would “cleanse” the dark zone if given the chance) The thing that gave me the heeby jeebies was the fact that wheelchair doctor guy WAS the voice of HDS in the movies and could very easily play a MUCH bigger role in the things to come in S4.
I have to admit that S4 could be absolutely dynamite if the beans stick to the continuity thus far. And possibly have the events that will occur on Earth play a role in the creation of the light universe (and HDS) again.