Jerry, I suspect firing along the long line of axis offers higher probability of connecting v firing at a right angle. If your target is on Houston moving north then the TSBD would offer that but it eliminates Records bldg and Daltex. Once turn is made on Elm, all three locations offer what I mentioned. But I want you to think about something. If this is a conspiracy then it is to seat someone in power for the foreseeable future. The last thing this new regime would want is a crippled brain dead ex president being pushed around in a wheelchair with catheter and colostomy bag tied to his side by Robert and a grieving wife for years. This would mean in my opinion someone was on sight calling just what a Justice of the Peace would call, a coroner would call. Death or unsustainable injury. If this was a conspiracy then somewhere at the opposite end of that long line of axis would be your last resort. If that limo passes beneath that RR underpass with a live target suffering anything less than lethal wounds then your done. At that point all you could do is slip a trauma room 1 MD a million dollars to put a scapel to his aorta. Mr Dodd, Mr Price and that light colored plume you see dissecting the 4th oak near the end of the fence about 5' up from the ground in the Nix film corroborate each other. However in the 60's a lot of men smoked cigars and pipes so it may be just that. One thing is for sure, if you have to fire from anywhere west of the TSBD then its gonna cause 50 or 60 years of questioning a 6th floor window and lone nut gunman. They did and it has.