We had a senior English dan grade of Ki Aikido visit our dojo some years ago, he asked if he could demonstrate his Ki, non of his techniques worked, sadly for him he didn't bring a ``trained `` ukie with him.
Did that senior English dan grade of Ki Aikido lure & lead Uke's attack before physical contact is made?? Or was Uke's attack static??
I believe luring & leading put effortless Aiki into the equation, while static attacks put merely Nage's Ki extension into the equation.
In my opinion, based in my understanding of Aiki & Ki extension, we need both for our Aikido to work.
Just my 2-cents worth..