Simply want to add to any dan above the 4th are more or less honorary and doesn't necessarely reflect the skills... For example, a difference between a 4th and 5th may simply be that the 5th open a dojo in a region where there was none and, so, contribute to spread aikido (and bring new members to the associated federation)... That doesn't meand that the 5th is certainly a better aikidoka from a techical skills... He may then get his 6th because he write some books on aikido... And so on...
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