During the 1950s and 1960s, Kenshiro Abbe was always referred to as Sensei - I often see him now referred to as Shihan - Professor - Doctor - Hanshi.
Masahilo Nakazono and Masamichi Noro were always referred to as Sensei. I was surprised recently when looking at Derek Eastmans dan grade certificate from Noro Sensei - it was signed ` Shihan ` in 1963. I never knew Noro Sensei to ever use the Shihan title.
I still call Chiba Sensei - Sensei just seems so natural.
Co-author `Positive Aikido`