odudog

The footlocks are not part of the Aikikai syllabus. However, they could have been something that O'Sensei had studied in the past from other jujitsu arts. Seagal Sensei had learned from people that he said nobody knows or aren't famous. These people might have learned from O'Sensei though. From my small view, it seems pretty hard to find someone qualified to teach you these techniques yet still be in the Aikido world. They are out there for Seagal is an example.