What we need is a real person who is the same height and body mass to JC with legs of the same length , to sit in the actual jump seat of the JFK limo and determine the most probable angle of JCs legs in relation to his upper torso and shoulders which appear imo to be at an angle NOT parallel exactly with the side door, per as in the Z-224-225 frames
( Maybe Mr.Collins can do another actual empirical test like he has done before , when he demonstrated how a shooter in the 6th floor SN window could have sat on the box next to the pipes and be out if sight during the Hughes film)
The Knotts laboratory experiment (judging from their video graphic ) has what appears to me to be both of JCs legs basically parallel to the side door , such that his Knees would be pressing into the back of Kellerman seat.
But if JCs upper torso and shoulder line was turned somewhat towards viewing umbrella man and DC man as it seems to appear to my own human eyeballs viewing the individual frames of Z223 -Z225 then it seems to me that JC trying to keep his legs parallel , while his upper torso is having to twist slightly , would have been an uncomfortable position for JC, especially if he was holding the hat upside down with the well of the hat hanging off the outer (left) side of his left thigh , with his right hand holding the rim of the hat pressed against the upper part of his left leg.
And if that’s the position the laboratory guys were using then that explains why they cannot align the exit wound from JCs right side of his chest with the wrist wound in his right hand and with the left thigh wound.
I think theres probably only one way the SBT trajectory alignment is possible, and that requires both of JCs legs to be turned at some diagonal angle towards the right side door to the same degree his upper torso and chest and shoulder line seem to be in Z223-225. I have to speculate that would probably have been a more comfortable position for JCs legs having a bit more room due to that diagonal angle.
However, if there’s some follow up by other scientific methodologists whom can absolutely determine which way JCs legs were oriented relative to his upper torso and shoulder angle , which winds up matching the leg position the Knotts lab graphics show, then it would be a refutation of the Myers computer trajectory line and thus would prove the SBT is improbable.
The actual experiment in the 2003 Beyond Conspiracy to attempt to prove Myers computer model trajectory FAILED to prove the trajectory because the bullet that exited from the JFK replica , exited from the right side chest , in effect would have gone thru JFKs right lung rather than the throat.
Also Dr. Wecht, has NOT been refuted regarding his opinion on the slight deformation of CE 399 being highly improbable for a bullet that traversed thru thru 2 human body and ribs bones plus having entered thru the wrist bone of JCs hand BACKWARDs!.