Regarding the unidentified eyewitnesses inside Dealey Plaza, are you referring to Gordon Arnold?
With respect to your "binary" issue, Witt testified that he was moving down the knoll, directly toward Elm St, while trying to open his umbrella when the JFK Limo approached/passed by him. This is in direct conflict with ALL of the JFK Assassination Images showing the JFK Limo approaching the Umbrella Man standing stock still near the Stemmons Sign. Either Witt is correct and the Images are Bogus, or the Images are good and Witt is a liar. And during this same HSCA testimony, Witt positively ID'd himself as the guy sitting on the Elm St curb next to The Cuban. I bring this up in order to physically position Witt moving directly toward Elm St. Nobody is seen moving down the Knoll in this specific area.