Not really. I think he's starting to converge on "skin in the game" as a unifying thread for much of the other work. I could be wrong, but having read FBR and T

Not really. I think he's starting to converge on "skin in the game" as a unifying thread for much of the other work. I could be wrong, but having read FBR and TBS, I don't recall seeing it put this simply ("skin in the game") until at least Antifragile, if not later. I view it as more of a progression. Also, the style of the books is quite different. FBR is closer to a personal essay, whereas TBS is more of a mainstream nonfiction book, and Antifragile is the most philosophical/abstract.