Your "few minutes" for the JFK Motorcade to exit Dealey Plaza would alter the currently accepted time lines of several assassination Films, Photos, as well as the individuals captured in those images. It was inevitable that You would eventually realize that these accepted time lines are Not legit.
I'm prepared to be corrected, where is your footage/photos which shows no traffic on Elm or Houston and which is timestamped a few minutes after the assassination? Thanks in advance.
Since you are a non image posting expert, how long after the assassination was the "accepted time line" of this piece of assassination film?

I didn't label the next image but if the time is accurate then it looks like what I said is a reasonable scenario.
Have you actually read Hosty's note, all Hosty says is that Oswald went out to watch the P.Parade and we know Oswald went outside a few minutes later and would have seen part of the "stalled" P.Parade.
A President's Parade is more than 1 car!
JohnM

JohnM