Firstly, this version of Bell is FAR superior to the one I was using and will be far more helpful, so thanks for that.
I'd like to go slowly to piece together my thinking here. The first thing I'd like to clear up is your comment in an earlier post that in the Bell film Weigman can be seen walking towards Zapruder. As far as I can tell this is not correct but I might be misunderstanding something so I'd like to clear it up. It's not a 'gotcha' or anything, just a genuine attempt to work this timeline out.
In the Bell film we see the limo enter the underpass followed by 3 cars. The camera then quickly pans to the right and shows us the GK area, where we see Zapruder and Sitzman making their way from the plinth and, as it pans across, Weigman in a prone position from where he was filming the Hesters:

This is the moment just before there is a cut/jump in the film.
We can see Weigman lying on the steps. He has just finished filming the Hesters (Mr Hester can be just about made out in the shadows of the pergola, Mrs Hester is getting up from her prone position). Weigman turns around and starts to get up. In the bottom left corner we can see Hargis stood by the lamp post.
The film then cuts/jumps to the scene below. There is no way to tell how much time has passed but a few things have changed - Altgens has appeared out of nowhere, Weigman is now filming the Newmans and Hargis is now running across the road:

Do you agree that the Bell film does NOT show Wegman walking towards Zapruder?
Do you agree there is no way to tell, just by watching the Bell film, how much time has passed between these two images because of the cut/jump?
Do you agree that Weigman has moved from his position filming the Hesters to his position filming the Newmans?
Again, no 'gotchas', just honest questions.
YOU TUBE
"Did The Umbrella Man Signal The Shot That Killed JFK?" By - WW2 Mememto (17:19)
From 10:38 - 11:31 = a panning sequence showing the Uncropped Bothun Photo. On the (L) it shows Motorcycle Officer Hargis riding away on his motorcycle. On the (R) it shows Motorcycle Officer Haygood just entering the photo. In between these 2 bookends, it shows the Newman family on the ground, Altgens walking DOWN the knoll toward Elm St, Wiegman filming Officer Haygood as he rides down Elm St, The Cuban and Umbrella Man sitting on the retaining wall, the Chism family beginning their sprint across the knoll, etc. This crystal clear image will assist you in your time stamping. Our Forum "photo gallery" also includes this Bothun Photo, but it is nowhere near as clear as this photo is displayed on YOU TUBE. And remember, the earlier a time stamp you apply to the Wiegman footage, the earlier you are also placing this Man walking down the sidewalk that runs from the Shelter to Elm St on the (E) side/TSBD side of the RL Thornton sign.
The image of Wiegman running toward Zapruder is on the Bell Film BEFORE the still frame you posted.
For the record, I do not believe that Wiegman was laying on the ground when he filmed the Hester's. Why would he lay down when filming? Do you know of any other time he laid down when filming that day? I also do Not believe that Wiegman ever climbed atop those steps. I believe Wiegman was Standing on the grass just in front of those steps when he filmed the Hester's. After filming the Hester's, Wiegman started moving (W) on the grass in the direction of Zapruder above and in front of him. What we are seeing on the Bell Film is Wiegman is FALLING. The Bell Film shows the Wiegman figure to be in the position of falling toward the ground. Who gets UP from the ground like we see Wiegman on the Bell Film? Nobody does. There are only 2 explanations for Wiegman's body position on the Bell Film still frame you posted. Either Wiegman is: (1) FALLING to the ground, (maybe he tripped?), or, (2) he is willfully DIVING to the ground. Wiegman did say he felt the "compression" of a bullet on his face during his segment on, "Unsolved History JFK, Death in Dealey Plaza" (2003).
With respect to the Wiegman Film being deemed "filmed continuously" for 30 yrs, we really have no idea what was being viewed on the Wiegman Film during that time period. Dating back, on this Forum, there was a letter posted from Gary Mack directly addressing this "filmed continuously" issue. And remember, NBC has steadfastly REFUSED to release their Original Wiegman Film. Same goes for NBC and their Original Darnell Film.
Your Questions
(1) The Bell Film DOES SHOW Wiegman moving (W) toward Zapruder. Your posted Bell Film still frame is too late to show this.
(2) As to estimating the time passage between the 2 images due to the "cut/jump", this is why I mentioned Wiegman being in the process of falling to the ground on the Bell Still Frame you posted. How long was Wiegman on the ground, before he got up and then ran down the Knoll to film the Newman Family? This is yet another variable that is Unknown.
(3) Yes, I agree that Wiegman did move from filming the Hester's to filming the Newman's.
That Uncropped Bothun Photo shows Officer Hargis riding away as we see Wiegman filming Officer Haygood entering the Bothun photo on the (R). Hargis gave WC Testimony that he left his motorcycle, crossed Elm St, went up to that "little wall", eyeballed the top of the Triple Underpass where he thought a shot came from, moved to the light pole, eyeballed the TSBD, and then returned to his motorcycle on the other side of Elm St. How long do you believe it took Officer Hargis to do ALL of this? And, I thought we were seeing Officer Hargis still near his motorcycle on the early frames of the Wiegman Film that show the JFK Limo going under the Triple Underpass?
Thanks again for tackling this timeline issue.