We still have the tradition of not practicing randori very often. The tradition was to have a solid class or two devoted to randori before dan exams so everyone could practice, but no more than that. The way it was explained to me years ago was that he wanted to use randori (multiple attacker) as a "stress test" of their overall skill level to help board members better evaluate the person being tested. So it was sort of a "diagnostic tool" especially at the initial dan levels to see how well they adapted to a higher stress and intensity. So he didn't want people to spend time practicing the randori extensively right before a test because he wanted to see people pushed outside of their comfort zone...............
We had a study group that started the test before I took mine.......6, 7, 8 or so folks meeting on Sunday mornings to run through the drills and thoughts....getting differing opinions on how to handle it. .... no one in charge. Everyone got to be in the middle a bunch of times. It also allowed each of us to get a better handle on who we were in our approach. As an example James Nakayama flowed by and through folks like a fish in water....for me it was enter, center up and toss'em.....sometimes with a pivot, some times behind me and sometimes at my feet. Each of us was different and the practice established in each of us our individual sense of it. Randori is not like single up practice....space, times, mixed flow, varied speeds, split awareness, bodies all over the place...any number of things separate it from one on one. I realize that was Kobayashi Sensei approach and I/we had reviewed this, talked with our instructors and could find none of our crew that bought into it...so we practiced......