If Dougherty is one of 2 gunman on the 6th floor TSBD, then it is much easier to work out the escape of the other gunman and how his rifle is never found, and only the MC rifle found in the boxes.
A car parked near the west side of TSBD by the west side of the roofed part of loading dock (annex bldg) could be aligned very close underneath the NW side window of TSBD, (closest to the rear staircase) This would facilitate rapid removal of a rifle by simply dropping it out that west window by a SW window shooter running to that window in approx 10 sec after shooting his 1 and only shot at Z313.
Dougherty could be the other shooter, firing the MC rifle (from the SE window) to hit JFK and Connally with a single shot atZ223 then aprrox 4 sec later trying for the head shot , missing slightly high, and that round hits the curb near Tague by the Triple Underpass.
0.8 secs later, the Z313 shot is fired by the SW window gunman with the 30.06 hunting rifle with large scope that Arnold Rowland had observed briefly in the hands of the gunman approx at 12:15 pm.
The SW gunman can enter the west elevator by 15 sec post shots (after tossing his rifle out the west side window at 10 sec post shot).
Dougherty could have moved the West elevator from the 5th floor to 6th floor after Bonnie Ray Williams exited it approx 12:25pm in preparation for the SW gunmans escape.
SW gunman descends to 1st floor at 5sec/floor speed of elevator, and exits west elevator by 45 sec post shots
He is not of LOS of Baker/Truly as they are still in the front entrance lobby just about to open 2nd set of glass doors
There is some question if the west elevator descending would have been seen by Adams and Styles who are on the rear staircase at this time
Exiting at 45 sec from
West elevator on the 1st floor, the SW gunman would not be in LOS of Adams and Styles on the staircase, since they have not yet reached the floor landing.
Exiting from the rear door nearest west elevator, places the gunman inside the roofed part of the loading dock annex bldg, from whence he then has choice to go out the east facing nearest door or turn westward and travel approx 80 ft to a west side door exit ( near where the car was parked to pick up and drive away with, the rifle tossed from the 6th floor west side window at 10 sec post shots
It is questionable if the west elevator could be returned to the 5th floor by 70 sec post shots by Dougherty by remote control, such as would be necessary if Truly is observing it looking up the shaft at approx 75 sev post shots