Originally Posted by
J. Mijares
The instructors at the Toyama Military Academy examined the battlefield dead and realized that the kesa-giri cut had a much better chance of doing more internal damage than a straight downward cut.
-- Jay
I read somewhere that they also studied testimonies & reports from the Boshin war & Satsuma rebellion as the two conflicts was loaded with sword fighting.
Cant provide a source though.
Fredrik Hall
"To study and not think is a waste. To think and not study is dangerous." /Confucius