Most people study Aikido in the traditional manner. This means the techniques are learned physically. Through training you can learn to transcend the physical confrontation and lead your partner's intent or ki.
Traditional training also means little, if any, discussion is given to ki or ki development. This parallels traditional Chinese Tai Chi practice, where the teacher says little or nothing about Chi/Qi.
When Koichi Tohei formed the Ki Society, he deliberately emphasized ki development. In contrast, Aikikai emphasized the martial traditions of O Sensei. This split from Aikikai was tramatic. There are still intense feelings that I don't see ending soon.
Just thought you might like to know why there are so many ruffled feathers, when you write about ki.