He could not have been teaching Nakamura stuff in Ueshiba's dojo or to Ueshiba's students. We should try to inventory those early drills.
Again, that's why I thought he was teaching them outside of normal classes in a sort of kenkyukai format. This format continues in most Ki Society dojos that I've visited, separate Ki classes and Aikido classes. I do realize that Tohei (for whatever reason) seemed to downplay how much of what he was doing came from Ueshiba, but it would seem to me that more lines of the Aikikai would continue these drills if their origin had been OSensei rather than Tohei. Further, the period where Tohei was most influential was after the war when OSensei had retired and left the Chief Instructor responsibilities to Tohei. So it's not like he would have been teaching this stuff while OSensei was watching, he was a long way away in places like Iwama or Shingu.