Re: Who's eligible to teach Aikido? And what level a sensei should be?
Let's get serious here.
No rank past 3rd dan is actually tested for.
It all becomes political after that level.
Rank is highly overrated and very misunderstood by most beginners (and many non-beginners as well).
Personally, I'd be much more concerned about skill level and the ability to impart that skill to others.