A while ago I found some topics on taking ukemi by sensei.
I put a movie on youtube where you can watch Hideo Ohba taking ukemi for Miyaki. Both are Tomiki Aikido, the movie is taken in the seventies.
When I trained at Okubo Sports Kaikan in Tokyo, Ohba sensei was also taken ukemi for me when he explained some details. This was in the late seventies. I was really surprised that sensei was taken ukemi for me.