My copy of Rory's book is in the mail. I'm about 100 pages into Jason's book. I'm finding it interesting, yet rather unfocused in some ways. I often get to the end of a section without a clear idea of what the main point was. If the point was to make me draw my own conclusions from some information, then I guess it makes sense.
The overall point of the first half of the book is clear enough, however. His main premise is that what gets seen in the ER (and morgue, I guess) tells us what sorts of things work on a regular basis, rather that what might work once in a million times. This goes equally for what to use and what to train hardest to avoid or defend against. He's purposely neglecting what he calls ego-based outcomes (getting beat up but not seriously injured). He's also purposefully excepting the particular martial arts needs of LEOs in that analysis. There are some interesting implications there for grappling versus striking focus, and interestingly enough, there's some gender-based differences in the data as well, which might mean that the curriculum for women and men should be somewhat different if self-defense is the motive for training.