When my teacher Tokimune was still active and in good health, many of his students from all over Japan came to Abashiri once a year to take part in the annual Headquarters meeting. Several times, when I came to participate in the headmaster direct transmission seminars (soke jikiden kai) that were always held on these occasions, the meeting was divided into two groups, one taught by Tokimune sensei himself, the other taught by me acting as his instructional representative. Naturally, the day before these my teacher would go over with me in detail about what he wanted me to teach on his behalf, and he always told me that I must not teach the true techniques that I had learned from him.
Even in regard to the very first technique taught in Daito-ryu, ippondori, I was strictly prohibited from teaching the real version I had learned directly from Tokimune sensei, and was told to teach only the version of ippondori he always taught in his own Daitokan dojo.
My teacher explained his purpose in this by saying, "What will you do if you teach people the true techniques and the next day they leave the school?
The oral and secret teachings of Daito-ryu will flow outside of the school." He also said,
"Out of a thousand people, only one or two are genuine students. Find them out and teach them what is real; there is no need to teach such things to the rest." My teacher only taught real techniques to a person if he could ascertain, from his questions, technical and physical ability, apprehension, and diligence, that they carried a sincere and genuine attitude.
He inherited this method of teaching from Sokaku sensei.