"Where did the circle go? "
Irimi means "To enter".....FWIW I was taught that the sword is pressed against your opponents neck as you turn....not like Nishio does it....but you are all over the place once again Bill

first you use Nishio, then you use somebody who practices Sport Aikido

" Tenkan" or what are referred to as positive and negative throws.........in sport you don't..a very bad example to prove a spurious point