Re: The Way of Aiki
I prefer to refer to it is as hijacking their momentum. The “blend” or “harmonizing” is the initial matching their movement so they are unaware of the moment that you connect and begin to redirect their movement. Both at the point of contact, so they initially feel nothing, and to a lesser extent with close parts of the body, so they do not see a visual que of diverging movements. The visual bit is more a side effect rather than a goal.
In our case the kuzushi is often achieved with a small body shift while both bodies are connected. The movement being small enough that uke does not perceive the unbalancing until it is too late. So small kuzushi with the body shift, followed by the throw, which amplifies the kuzushi with a larger movement after the initial unbalancing or degradation of uke’s structure.