Its worth considering that jamming (stopping movement) has diminishing returns and is really not a way to go. It is far more effective and useful to "change" and keep movement going. A bounce-or the way I would bounce people- is all about redirecting force, not hitting power to power. At no time do I ever consider power-to-power acceptable.
I agree with everything you've said. I was thinking primarily of techniques like the one Ellis taught us years ago to reverse a shiho nage. It did involve a movement that I would call "jamming" (you struck your own arm to prevent the opponent from passing it throufg to the lock) but it also flowed instantly into a redirection. It did have an element of power to power and it felt like you'd hit a wall when it was done to you. Since the redirection was instantaneous it might not really qualify as "jamming"; it was definitely a "bounce".