BTW, let me add that I watched a number of Ikeda Sensei's video demonstrations and on a few of them, Uke anticipated Ikeda. I'm assuming that sort of thing is more the exception than the rule. All explanations can go out the window when cooperative Uke's have to be factored into the equation.
Ukes are only human. Even when we are trying not to anticipate or are trying to give an honest attack we can slip into a pattern if we forget to be mindful. In training horses anticipation is something I see a lot of. Once a pattern is established the horse will of course continue to follow it. If you don't want them to anticipate your next request the best way to avoid it is to not establish a pattern. Perhaps the same can be applied to ukes.