Becoming an instructor
I'm curious to get people's thoughts about at what rank you can become an instructor. My impression is at 3rd Dan you are able to be a teacher, however I see dojos out there where the chief instructor is shodan. An extreme case is I've had an instructor that has said many many years ago they started teaching at a local YMCA when they were 3rd kyu, only because there wasn't any other teachers in the area and they still wanted to train.
Is it bad to spread the art of aikido if you are a low rank? And at what do you feel is an appropriate level that someone could begin teaching if there was a need for one?
Thank you for any insight,