Re: Becoming an instructor
Aikido being what it is I don't think rank is much of an issue as much as actually being able to teach.
Look at it this way, a 1st kyu probably has 6-8 years experience which is more than in most arts where you could easily be 2nd dan and since they'll be teaching beginners they don't have to be anything special as long as they are competent teachers. 3rd dan is, IMHO, over kill for teaching beginners. Also you have to consider what rank the instructor will be when his students reach shodan.
For instance my instructor was shodan when he started the dojo, he was san dan by the time we were 1st kyu so his capacity to teach and his own knowledge base was always far enough ahead of us that there wasn't any issues.