I would actually disagree with even this point. it is more a thing that happens; to the extent that you can do it or use it or apply it, that reduces to a matter of you being in the right place at the right time (possibly with the right structure or alignment).
Could it also be that aiki is a phenomenon that is so complex to implement, that it merely appears to be something you are powerless to control, a form of magic where your main job is to just let it happen, if an explicit process of instruction on how to do it hasn't taken place and a lot of work hasn't gone into mastering it? What if there is never a wrong place or wrong time, you're just always expressing aiki that you have trained into the mind/body?
Putting aside the trope, or perhaps invoking it, that any sufficiently advanced technology is indistinguishable from magic, aiki does not have to be magic. Aiki does not have to be something that just happens, you are always working on making it happen, by use of the mind's intent. If it doesn't happen, that means we simply sucked at doing it.