Re: significance to testing/belt rank?
I personally am not aware of any Yoshinkan affiliated dojo where there is no possibility of failing a test. I've failed tests myself.
What dojo are these? Do they represent all of aikido, or only a portion?
PS. For me personally the consequences were that I spent quite a bit of time (almost every training session, between 5 and 6 days a week, for about two months) prepariing for the re-test. But hey, that was just me...