Just did a bit of research. Sensei got his 6th degree in 1996 and was awarded the title of Shihan in 2002.
Also found this on aikiweb. Not sure how up to date this Birankai list is either.
http://www.aikiweb.com/wiki/Birankai...7de83d9bea8eec
Since his was awarded in 2002, I wouldn't even say that 2002 list was even up to date in 2002. Go figure.