Sorry about the lateness of my response. Here you can find the History of DNBK and the international division of the organization. I wanted to post the whole article, however the material is copy righted, so I can only post the link:
Hope this clarifies the situation.
As I said, the information here
is a little better, if you can read Japanese.
The post-war organization has no real connection to any major Aikido organization that I am aware of. There's nothing wrong with that, of course.