Daryl,
I was lucky enuff to train with Yokoyama quite a bit, all BJJ though. The only time I did Judo was that time after practice and that was enough. The guys a monster. He's straight up ripped and nice as hell. Went out drinking with him a few times as well. I was just looking at some pictures and we were at some karaoke place. Good memories. Also check out the Jenjukan at the Fukuoka Budokan. The main guy is Kozeki. He trains the riot police in Judo. They're nice people.
Mark,
I'm shit with names. I just remember the ones that stand out. If you were into Judo and really liked Kousei Inoue and then found out that Yokoyama and Inoue were training partners, you'd remember.