Peter Rehse wrote:
Just a different classification scheme - one that I understand originated from Ueshiba M.'s students rather than the old man himself.
One man's technique is another man's variation.
I suspect that ikkyo, the aikido version of ippondori, is a single idea, concept, or principle that encompasses the 30 techniques in ikkajo. IOW, perhaps once one understands the fundamental principle of ikkyo, the other 29 techniques become variations of the (1st) principle. (Sorry, couldn't resist the pun)...