Well, can't talk about Hatsumi but Rory Miller went from judo to classical jujutsu and found the latter very applicable to real world violence, and his experience can hardly be discounted.
Interview: Rory Miller, Detentions Specialist and Conflict Expert - Ikigai Way
I just thought I'd drop this interview here.
Interview: Rory Miller, Detentions Specialist and Conflict Expert - Ikigai Way
I just thought I'd drop this interview here.