You're really going to make me explain the English language to you?
I will turn/I will make a turn - This is something that will happen in the future.
I am turning - This is something happening in the present moment
I have turned/I have made a turn - This is something that has already happened. Another way to phrase this is to say THE TURN HAS BEEN COMPLETED
No! The word "completed" is yours. With the exception of Carter, the occupants do not provide any further details of how far they had turned. Normally, on a 90 degree turn, if you make a turn off one street onto another you are very close to completing the turn. But not this turn onto Elm which was a 120 degree turn. Carter described the security car being along side the TSBD. I suggest that means the car was turned 90 degrees, not 120, so that it was parallel to the TSBD front. To the extent that "along side" might be somewhat ambiguous, the ambiguity can be resolved by Mrs Cabell who gave a very specific position of her car: she was directly facing the TSBD at the moment of the first shot and just had to look up to see the rifle in the SN directly in front of her. I say that the Cabell car had to have been in this position for her to be directly facing the SN when she looked up:
According to your diagram, that corresponds to frame z195:
You then insist that Mrs Cabell corroborates this statement - please demonstrate how this is the case.
You obviously have not taken in my previous posts. READ HER EVIDENCE and tell us where you think he car was and the zframe that it corresponds to.
To be clear: I am not saying that the witnesses in the VP car and VP security car rule out any possibility of a shot at z223. I thought I made that clear in my first recent post. What I am saying is that this evidence is also consistent with a first shot at z195 ie. it does not conflict with a shot at z195. The difference, about 1.5 seconds, is too small a time difference to distinguish based on the statements of vehicle occupants alone. One has to look at other evidence, such as Phil Willis, the Secret Service Film, Mary Woodward, Jane Berry, etc.
The importance of the motorcade evidence is to establish a "before bracket" for the first shot. The "before bracket" establishes a time that the first shot was not before. The motorcade evidence which establishes that the VP car had just finished the full turn onto Elm (and had straightened out) positively excludes a first shot before z181, which is the last frame in which the VP car is seen and it still has not finished the turn. This fits with Betzner who said he took his z186 photo before the first shot. This fits with Hughes who said he stopped filming (which stops at z185) before the first shot. It fits with Woodward and Berry and other witnesses along Elm.
The "after bracket" is more difficult to establish. The only definitive statement is that of Phil Willis who said that his z202 photo was taken at the moment of the first shot - that the sound of the shot caused him to press the shutter. If that was an accurate recollection, that would put the first shot sound arriving at his ears about 150 ms. before he pressed the shutter in order to allow for a physical reaction to the sound. That fits a first shot striking JFK no later than z198, with the sound arriving 75 ms. later and the shutter pressing 150 ms after that. That is consistent with Linda Willis who said that the President was between her and the Stemmons sign at the time of the first shot. That puts it between z195 and z205. It is also consistent with Rosemary Willis who turns her head sharply toward the TSBD at z204. She said she saw pigeons fly from the TSBD. Jack Ready, who said he immediately turned to the rear in response to the first shot, removed his hand from the front handhold at z200 and proceeds to turn to the right from z200-207 before disappearing from the zfilm. That indicates the first shot was earlier than z198.
I will admit that the amount of evidence that can be used to establish an after-bracket for the first shot is not as much as the before-bracket. But it is consistent with a shot before z200 and inconsistent with a shot any later.