And, in my opinion, if we teach, we should not immediately start teaching the aiki-ness before they learn the kata, or instead of the kata. But that is what many do. I say - Kata first, then add aiki. You can`t add aiki to bad technique.
I actually think that they can and should be taught simultaneously. As we do where I train with the Tohei Sensei ki warmups that mimic the form of the kata movements (and that can also be used as solo training if one figures out how to do that...) why NOT also teach slow, basic exercises to beginners, for ten minutes at the start of class, so people begin to develop sense of what it feels like