I've edited the last part of my post, so please re-read it.
You asked me what I thought (my opinion). I have given you my current thoughts. I do not ask you or anyone else to agree with my opinions. If I am the only person who ever believes these things, that is fine with me. I also have evolving opinions as I go along and find more evidence. So these opinions are definitely subject to change. I am not locked into any specific scenarios. I try to keep an open mind about everything.
Regarding your latest revision of your response, I suggest that when we view the Zapruder film at normal speed (real time) we can see how fast these things actually happened. In other words, the amount of time (aka: frames) you are concerned about elapsing is relatively very little real time to form thoughts and react.