At the end of the day it comes down to making logical assumptions based on the evidence and within the context of this environment what I believe would be court accepted "proof beyond a reasonable doubt".
1. Both videos show 3 people walking side by side, with virtually no one else close by.
The Darnell clip is too tight to know whether this is true or not. Unless you're just talking about immediately behind them. But then the blob that is supposedly Darnell in Towner is running behind those figures.
2. Both videos show 3 people walking away from the Elm street monument.
The Towner figures could be walking parallel to the pergola.
3. Both videos show same 3 people heading the same direction.
Roughly the same direction. Whether it's the same three people is what is being debated.
4. Both videos show a lady on our far right wearing a light headscarf.
There's a blue patch in Towner that could be a headscarf.
5. Both videos show the person in the center to have a light coloured head.
But in Towner, is it the person's head, or hair, or some kind of head covering?
6. Both videos show the person on our far left has a dark head.
In Towner, that person is almost entirely obscured. Where's the edges of the head?
7. Both videos show that all three are wearing clothing which appears dark in shadow.
Well, supposedly Stella Jacob was wearing a light colored skirt. At least according to the claim that she is also the leftmost Zapruder sign lady.
Without any knowledge about exactly when Towner was filming and when Darnell was filming this particular clip, and given the resolution of the Towner clip, it's all guess work and confirmation bias.