I never said his response was of use, only that he responded. He told me that my teacher's rank is registered at aikikai but mine is not (information that I already knew). After inquiring again about the possibility of having my rank registered at the aikikai, his response was as follows:
"It would be better to contact to the Aikikai authorized person or organization in your area."
Not very useful at all I'm afraid.
Yes, I suspected this when I wrote the original post. I nearly wrote, 'hope
his response was of use.'
However, Robert Watson's answer is right. The emphasis has moved from individual shihan awarding dan ranks to organizations, and the older 'super-shihan', like Tada and Tamura, will not be replaced. So you will have a pattern of recognized aikido organizations, whose grading practices will be closely monitored by the Aikikai. Those who somehow fall through the cracks, like yourself, will need to create a new organization or establish a relationship with an existing one.
Actually, the problem of 'ronin yudansha' is not a new problem and I am occasionally contacted about the US military, for example, when American yudansha are sent to Japan and wish to maintain their relationship with the Aikikai.
If you PM me, I can perhaps give you more detailed information.