Hmm, what you're saying makes sense, because the way you explain it makes it sound like it would have the opposite effect and let them act inside your OODA loop. Maybe I'm reaching too far, since it's not a topic I'm well-versed in.

I've heard cheng and chi translated in other ways, like "ordinary" vs. "extraordinary", "direct" vs. "indirect," so maybe "unpredictable" doesn't really apply here. I read it as being more about conflict within an ever-changing environment. If the world is constantly falling out of order, the advantage doesn't go to the one with the most consistently rational strategy, but the one who responds to change the fastest. So instead of making your opponent confused about your strategy, the goal is to degrade his perception to make him unable to keep up with reality itself. This is all very theoretical and abstract though.