I've met individuals at seminars who are convinced their 1st kyu instructor at the local college aikido-club had a better shihonage than the guest instructor at the Seminar...and that guest instructor was Shibata Sensei.
You'll appreciate this... Back in the seventies Saotome Sensei would periodically go out to California to teach seminars for a couple weeks at a time. One time, he took Ikeda Sensei and he sued Ikeda Sensei for ukemi. It was all atemi waza and Ikeda Sensei basically tried to kill him and he did his thing.
After the demo, a shodan level hippie lady who had a dojo somewhere in CA came up to him and informed him that he hadn't understood O-Sensei's message of peace and love. This to a person who had spent fifteen years as an uchi deshi from a person who had never even met the Founder. You can imagine Sensei's reaction...