There's more, of course, like the reasons why Sagawa decided turn down an invitation to teach at Aikikai Hombu Dojo that are public - and a lot more that are private.
Nice twist, disparaging remarks?
Once again missing the point. How he behaved. It's a martial thing. He didn't go around continuously nattering about others. Unlike some modern folk.
Being so far advanced and disciplined he had more opportunity to yet rarely did.
Thus those who commonly do shows me merely lack of advancement.