I have gifted you with some knowledge. You're welcome. You thought Harry was Only present, "throughout the processing of the camera-original film". Do Not feel bad. Nobody knows how everything went down in this case. There are Many areas that remain Murky and some just Completely Unknown. The location of the Officer Chaney/Lead Car Event being shrouded in mystery to this day. As for your math, you better stick to mistaken Zapruder time lines.
I am absolutely staggered that you could find the time to take a break from your research to 'gift me with some knowledge' from your vast and insightful understanding of the case. We can certainly agree that nobody knows how everything happened that awful day, as you yourself have so clearly illustrated on many occasions in the past.
As for my math, I was trying to show - by means of an obviously ridiculous example - how convoluted your "logic" was, and it seems I was successful, as you didn't "get it" at all, and like your reference to Chaney and the Lead Car, I don't know what your reference to "mistaken Zapruder time lines" means in the context of this discussion.
I appreciate your taking the time to education me, but please don't feel under any obligation to respond, as I have neither the time nor the inclination to continue this exchange.