With a profile and career position like sushi has (and has to maintain), i'm not at all surprised he has not posted on the forums.
Travelling is exhausting. Conferences are exhausting. Posting on these forums sucks time like the baby to the nipple or the milk vacuum on the cow.

I would have loved to attended one of his talks though. His research is fascinating.

"Those who preach the myths of audio are ignorant of truth."