Daniel,
You seem to have a flawed understanding of what a Mach cone is. The cone shape represents how the sonic crack propagates in relation to the bullet’s position. It does not draw a border that confines the sound. The sonic crack propagates in all directions from the line-of-fire and travels for a long distance. I tried to find online sources that quantify what that distance is but did not find anything, unfortunately. However, from my own analysis, I can say that at 75 meters off the bullet’s path the sonic crack is very loud. I put together a video for you that clearly shows this. Please be sure to read the description for the video since there is a lot of important detail there.
Don’t Run - All Shots in Slow Motion
It’s been a year now, so maybe you all have forgotten, but three of us here on this forum invested dozens (hundreds?) of hours working independently and using different approaches to analyze the gunshot audio data, and we all came to the firm conclusion that the first 8 shots were all fired from the same spot, within a remarkably tight radius. Despite those clear findings, the multiple-shooter theories abound. Oh well, I gave it my best shot.
Greg