Re: Aikido ground technique orgin
I come to understand the wrapping kind as in a) type grappling comes from pure grappling, in kodokan case, the syllabus may come from the Fusen-ryu school.
In the case of Daito-ryu (which incidently is where M. Ueshiba majored in), it is not grappling per se. I think the ground technique is mainly to hold someone momentarily, so that you could access your secondary weapon (i.e., your wakizashi) to disembowel the assailant.
The holds are also easily disengaged to deal with multiple assailants, should the need arises.