Found something:
Randori practice, sparring practice, is something that is done to give life to, and demonstrate the real power of, those techniques that were first learned by the student through kata. That is to say, randori provides the means to complete a painted dragon by filling in the eyes. The martial arts techniques of the old jujutsu schools, however, were quite varied and had numerous styles of hand to hand combat. Thus, it was impossible to incorporate all of these styles, let alone their accompanying techniques, into a single system of randori training. In emphasizing the nage-waza, the throwing techniques, Judo had perforce to largely leave out the atemi-waza, or striking techniques, and the kansetsu-waza, or joint locking techniques. Accordingly, I have brought together the important parts of the atemi-waza and kansetsu-waza, and the organization of another system of randori training is the subject that remains before us.
From:
http://www.centrallondonshodokanaikido.co.uk/training/
** I "think" that it's Tomiki Kenji's quote, but it might have been mis-cited? Who knows whose it is? Could be Sensei Kano, maybe?