Robert M Watson Jr
Depends on the organization guidelines. Certainly no aikikai rank can be grant in such a way.
I don't think that's quite right. In the Aikikai I've seen people recommend for promotion up to their own rank - or even higher.
The thing is, there's only one person in the entire Aikikai who actually grants promotions, everybody else (even the eighth dans) only recommends. So, basically speaking, it all depends on what Doshu feels like doing and will accept...