My understanding is that Mr Stratton trained Yoshinkan, but Pat Stratford learned from Tanaka Shigeho, who used to teach at the dojo attached to the Meiji Shrine in Tokyo, but received his dan ranks from Ueshiba Morihei and Kisshomaru Doshu.
When I first started aikido at Sussex University, my teacher Tao Norio affliated our club with Mr Stratford. When Tao returned to Japan, the club came under the direction of Chiba Sensei's students and eventually Chiba Sensei himself used to teach there.
Mr Tao and I are still good friends and we occasionally.
As I stated in a earlier thread I could possibly remember other names of aikidoka who might qualify as early Aikido pioneers.These names come to mind.Pat Stratford, Eddie Stratton , Tony Drinkwater Senseis. Stratford Sensei I believe did Yoshinkan, Stratton Sensei , founder? of Shudokan, and Tony [from Manchester] was active around the 60s /70s with Aikikai of Gt Britain.