Just compare the positions of Oswald and Leavelle and the changes and movements that they each underwent after the shot. Leavelle gets turned around 180s degrees from where he was, while Oswald becomes horizontal on the ground instead of vertical, and he's lying 90 degrees to how he was standing. THEY WERE SUPPOSED TO BE TIED AT THE WRIST. So, how could they both be moving in totally different and unrelated ways and do it with no sign of pulling on each other at all? How is that possible when you are tied at the wrist?
It is not remotely credible that they were handcuffed together.