I’m not sure what prompted all of this effort, and I’ve rarely heard Kelly described as corresponding to log utility, only ever as an aside about mean-variance optimization. There, log utility corresponds to A=1, which is also the Kelly portfolio. That is the maximally aggressive portfolio, and most people are much, much more risk averse.
If anything, I’d say that the Kelly—log utility connection obviously suggests one point, which is that most people are far too risk-averse (less normatively, most people don’t have log utility functions). The exception is Buffett—empirically he does, subject to leverage constraints.
Did you take vitamin K? You really need that to process vitamin D. This LessWrong post goes into more detail. Quotes from the article: