Re: Instructors of low rank
I think it depends on what you mean by "instruction". If it is a rote technical aspect...that is, say the basic mechanics of kotegaehsi. Then pretty much anyone that has been studying aikido for a year should be competent to teach it. You know, it ain't rocket science!
Howver, when you start talking about Aikido, which implies a comprehensive system of study of personal development...well then it requires a great deal amount of skill and wisdom that must be applied over the long run.
That, takes someone with a higher degree of experience and mastery that is usually measured in years, reflected typically through the awarding of rank.