I've never met or seen Watanabe sensei but generally I'm with Larry with respect to no touch throws. Why just last week one of my students did one to me because I - wait for it - overanticipated what I knew he was going to do. Bad Peter Bad (I constantly harp on not doing that).
A thread awhile back either here or on e-budo described several high ranking Shihan from Aikikai Honbu tut tutting and rolling their eyes during a demonstration of no touch throws. Maybe they know something or maybe they don't. However, I don't think my skeptism is misplaced.