Dan, the diagram map that was posted by Andrew Mason shows a red LOS line going thru the tree at Z195😳
If there are ONLY 3 shots and the 1st shot is a hit at 195 as theorized, and hits ONLY JFK then the 2nd shot that hits Connaly defacto must be at approx z223-225 as it’s quite apparent that Connalys right shoulder is being abruptly rotated counterclockwise.
I’m dubious of 2 separate shots fired unless someone has some evidence of an suppressed shot fired which of course means 2 shooters at least.
According to the evidence, the last shot struck JFK in the head at z313 and the shot pattern was 1........2...3 (the second shot coming after the midpoint between 1 and 3 and 3 following 2 in rapid succession). So, according to the evidence, there was only one shot by z225 the second coming after z250.
And the tree is an obstacle that the SE window shooter is very likely aware of so even if it can be proved that the leaves were less dense in 63 , it’s stiil questionable to choose to take a shot between z186-z210 when the tree branches are an obstruction rather than taking a shot just prior to it just afterwards when there is a clear LOS.
I am not sure why the FBI thought that JFK was not visible from the SN until z210. That opinion was based on a reenactment using the wrong car and showing the tree as it appeared in late May 1964 after gaining new growth and foliage that were not there in November 1963. Mind you, they were not able to figure out that Phil Willis' photo was taken at z202, almost a half second before z210, so I wouldn't put much faith in their expertise in such matters.
It is apparent from the Secret Service film done about 2 weeks after the assassination in early December 1963 that JFK was visible before he reached the Thornton Freeway sign and just after he passed the lamppost that was about 10 feet before the sign:
JFK was halfway between the lamppost and the Thornton sign at z195, as can be seen from this diagram which uses the sightline from Zapruder to JFK at z195:
The trajectory for the single shot hitting both JFK and Connolly does NOT have to be a perfect straight line.
There is possibility of slight deflections possible for a bullet going thru 2human bodies.
There would be a change in direction in passing through JFK only if the bullet is subjected to a significant asymmetrical lateral force. There was nothing in passing through JFK that could have provided that except bone, and it struck no bone. So the bullet would have traveled pretty straight until exiting. It did nick the left side of JFK's tie knot on exit which would have applied a slight and very brief asymmetrical force to the bullet but that would be to the left, not the right. All the ballistics experts said that the bullet would not have changed direction after exiting JFK.
There was a change in direction of the bullet in passing through JBC, but you first have to get the bullet to go into JBC's right armpit from JFK's midline exit location.
The only problem really is the apparent anomaly of the insignificant amount of deformation of CE 399.
That's not an insignificant problem!
Willis has the 1st shot fired not earlier than Z205 which is the approximate verified time of his photo taken relative to the Z film location of the JFK limo.
The Willis photo was taken at z202. This can easily be determined by aligning one of the Secret Service agents (Clint Hill) with the sightline from Zapruder to Willis.
If, as Willis said, the sound of the first shot caused him to press the shutter, you have to work back from z202. At that point a bullet would have traveled 175 feet from the SN to JFK. That would have taken 175/2000 = 87 ms. But the sound would have taken 175/1130 = 155 ms to reach Willis' ears. The human neuromuscular system takes, on average, about 150 ms to begin a physical response to a stimulus let alone complete the response. So that would put the shutter click about 155+150 ms after the bullet emerged from the rifle. That would put the trigger pull 5-6 frames (each frame: 55 ms) before z202. That is about the latest possible position of JFK when the shot was fired if Willis was right. At that point, JFK is quite visible.