Stevens answers as above, with techniques.
For Pranin, it's Ueshiba, Takeda, and Deguchi (
http://www.aikidojournal.com/catalog...ar&category=3). I wrote and asked him why he didn't include Inoue Yoshiaki, Osensei's cousin(whom he'd written of as a "co-author" of aikido, memory serving), and he just growned and mumbled something about a firestorm...