[Deuce]

I checked out your links and recognize that opinions I have held based on my own prior viewing of Zapruder are not necessarily as clearcut as I remember. Therefore, the SBT is more possible than I originally thought.

[Tares]

...not necessarily as clearcut as I remember.

It's always best to rely on photos and physical evidence. Eyewitness testimony is good too, but not as reliable, as your memories of the Zapruder film demonstrate. And photos and physical evidence don't have agendas or biases, unlike all of us humans. Keep this in mind when considering various aspects of the assassination.