Re: Ki is Kindness.
What if we view ki as having a naturally positive nature which gets twisted into something negative? My meager lessons in Jinja Shinto would seem to support this view. "Genki" (source ki, yes?) implies positivity and health, despite the fact that we can describe states of ki that are unhealthy or otherwise negative also. So while we might say some person is byouki, it's only because the original nature of the ki has been twisted, and returning to health would be returning to a genki state (the original state of ki?). Just a quick thought I had anyway.
Take care, all!