A bit off topic, but didn't Tomiki teach at Tokyo hombu after the war for a short time? Didn't Shioda also stop back? Or was Shioda just visiting Iwama? Shirata ... being an exception has reasons.
Tomiki did stop in at hombu occasionally, but I don't think he had a major impact there. I don't know if Shioda stopped in or not - but I've never heard that he did. He did stay in Iwama for a short time, but disappeared one day, only to turn up with the opening of the Yoshinkan.