Re: "Hidden in Plain Sight" - Takeda Sokaku
Actually, that's covered in HIPS. I don't know anything about this "revenge" thing - I think that's just people's fantasy. As far as I know, nobody was looking to revenge themselves on Sokaku anyway. And the idea of compassion to not "pass on" the family tradition denotes a kind of modern Western psychological insight that I have seen no evidence was part of his character - so much else that of the way he lived does not display that kind of insight.
I don't want to rewrite that chapter here - but in brief, I see him as "having" to move - that his early background and the innate character that "met" that background afflicted him with an "attachment" disorder - and moving around and the medium of teaching jujutsu waza in short bursts - enabled him to connect with people without getting tied.