YellowBirch1, Anthony DeFiore has the following two photos in his analysis available free by emailing him through his blog:


We were assured by Jerry Dealey on jfklancer.com that a Dallas streets engineer adamantly denied there was ever a sewer in such a position. The blacktop rectangle would seem to indicate there was. We may safely posit if queried the officials would have a ready explanation.
In DeFiore we see the termination of the balustrade is now punctuated by a tree grown large the past half century and by a relatively new concrete pad bearing two steel electrical cabinets standing sentry and blocking the view to a kill.
Tentative calculations show the limo at Z-313 with its known dimensions places JFK's skull some five feet below the stated Height Above Sea Level (HASL) of the balustrade at termination, a differential which over the 111 yards given the three degree Elm downslope presents a temple shot over the windshield.
I suggest no shot was heard from this area because a WerBell or other suppressor was used in conjunction with a low-power load to produce a subsonic speed.
That no one was seen is understandable for a number of reasons.
No sound or movement from an area far from the limousine and the crowd on North Elm.
The angle of the balustrade screens the area from the dozen on the overpass.
Distractions from shots from Depository and/or Dal-Tex Building and from the fence, with the movement seen behind the fence, and the smoke and smell of gunpowder there.
The crowd ran to the North. For a half century the focus was there as the alternative to the official propaganda.
I recommend DeFiore as a complement to Sherry's work.
We still have a throat entry wound to account for and DeFiore excludes other sources in his analysis.
Whether the sewer figures, we have Plumlee saying Sergio got muddy sliding down the backside--were the pair a screen for the team at that location.
Perhaps there was a car in that lot concealing a shooter. Again we have no sound, no nearby witness (discounting the Witt equivalent, Jett, who is the Church Lady's Sandwich Man).
We should allow the analysis to solve our two shots, temple and throat, two separate analysts working independently.
Perhaps identifying a single team.
It is a great era of consolidation.