You left out one big fellow who was close to Ueshiba for many, many years. I speak, of course, of Mochizuki Sensei, whom the daito ryu regards as a daito ryu master--one of only two men, including Tomiki, to get a scroll from Ueshiba.
Not to get all picky or anything, but many students received such a scroll -- Tomiki, Mochizuki, Yonekawa, Shirata, Shioda, Kunigoshi, Yukawa and I'm sure plenty of others. Many of them remarked later that they didn't think they were important or didn't understand what they were at the time. Ms. Kunigoshi said that at the time she thought that hers was just some kind of notes.