light is both wave and particle in nature does not mean that it is" half wave" and "half particle." Nor is it "both." It is, simultaneously, 100% each.
My brother-in-law is an astrophysicist and I was asking him about this coming from my social sciences background. His take on it was a little a different. It isn't so much that it is both, but that our current model aren't precise or accurate enough to explain light, thus it appears in current models as both particles and waves. This does not have to do with a dual nature to light, it has to do with a failure of our understanding of the universe.
I wonder if Ueshiba's own various uses of the word aiki are similar -- he hadn't really fully grasped what he was reaching for either, and was doing the best he could with the imperfect paradigms he had to work with.