Re: iwama note, censored?
Another possibility to consider here is the old "Kwai Change Kane" concept from Kung Fu where he was essentially ignored in the beginning. Perhaps the uchi-deshi were undergoing training and were required to not engage anyone regardless of their affiliation. I do not recall it being mentioned if anyone from the aikikai engaged one of them and what their response was to it. Also, how would they be able to tell what each person's affiliation was unless they knew them or they were wearing clothing identifying such? I'm not saying this was not going on as described, however, other possibilities exist.