In addition to Harvey Konisberg, you need to add Andy Demko of New Castle Aikikai and Eddie Hagihara of Long Island Aikido Association. Both are part of the USAF. They are also 7th dan and shihan.
Peter Bernath, Claude Berthiaume, Donovan Waite, Robert Zimmerman need to be edited as 7th dan and Shihan.
Other than Yamada and Sugano Sensei, here is a list of all the USAF Shihan, who are all now 7th dan as well. Source: http://www.aikidoeast.com/aikidoeast...structors.html
Eddie Hagihara Shihan, Long Island Aikido Association
Harvey Konigsberg Shihan, Woodstock Aikido
Clyde Takeguchi Shihan, Capital Aikikai
Claude Berthiaume Shihan, Aikido de la Montagne
Peter Bernath Shihan, Florida Aikikai
Donovan Waite Shihan, Aikido of Center City
Andy Demko, New Castle Aikikai
Robert Zimmermann, Toronto Aikikai