The comments about Kisaburo and Hayato having similar movement are interesting. I actually think they moved quite differently. I was very surprised when I moved to Tokyo and saw Osawa Hayato's movement and how different it is from his father's.
One thing I do see in common is their footwork. If I am remembering correctly, Akira Tohei described it as "suriashi" derived from the Noh drama.
I was referring to the knee flexing - you can see it around 1:48 when Osawa Senior does the ikkyo pin
But you raised an interesting point... does Hitohiro Sensei move like Saito Sensei? Or the Third Doshu like the Second Doshu? Or Shioda Kancho like Shioda Soke?