John - With respect to the Huge Gates being connected to the basement, look at the 3 TRAMPS PHOTO. The Tramps feet are the same level as the floor of the Brick Bld behind them, and the Floor of the loading Dock next to that Brick Bld. These 3, the Huge Gates, the Brick Bld, and the Loading Dock are ALL at the same level. Yet, you have to Walk UP Steps in order to enter the TSBD. Yet that is labeled the TSBD 1st Floor. Even the Very BOTTOM of the TSDB Windows which face the Elm Ext and lead right up to the Huge Gates are well above the FOOT Level/Ground Level of The 3 Tramps as we see on that photo. The floor of the TSBD 1st FLOOR is actually much higher/ well Above the floor of the Huge Gates, Brick Bld, and the Loading Dock. The TSBD is not built like it looks from the outside. All floors including the basement are Not entirely level. I see it as kinda like having a step-down living room. That living room would be on the 1st floor, but so would the kitchen which is higher. They are both on the 1st floor but do Not sit at the same Level. People that have lived in Multi LEVEL Houses know what I mean. These type houses can be built both "Multi Level" and Multi Story. Meaning there can be More than 1 level within an entire Story. This is the case with the TSBD. Just look at the floor of the Huge Gates in the 3 Tramp Photo and then compare that to the Floor of the TSBD 1st Floor AFTER CLIMBING UP The Steps. If you look at a schematic of the TSBD 1st Floor, just around the corner from that Dr Pepper Machine is another stairwell DOWN to the basement. Probably a very short stairwell. With Lovelady and Shelly giving WC Testimony of walking through the loading dock and continuing to walk into the TSBD, that stairwell connects to the Basement/Huge Gates. I do Not swear by Oswald using those Huge Gates. Any shooter on the 6th floor could easily plant the rifle, descend the stairwell, and just walk out those Huge Gates. A 6th floor shooter could easily be on and off the stairwell before Truly and Baker enter that same stairwell. Very Quick, Very Easy.