I was a senior in high school at the time. Over the years since, the most intriguing theory I’ve heard is the one about the SS agent accidently firing the head shot with his AR-15 from the followup car. Even with that I’m still certain Oswald fired the first two shots from the book depository and meant to kill Kennedy, and most likely actually did.
I’ve never heard that theory. I think Oswald was the shooter of all three shots. I could make the 3 shots
with my Browning 270 A-bolt Composite Stalker with Leupold 3X10 50mm objective scope in less time with a tighter grouping. I took down 3 wild hogs at a greater distance. The first shot was at a slow moving target. The second and third were hauling rump roast through trees and brush in 2 different directions. On the video camera the 3 shots took 5 seconds. But by what coincidence did his target end up at the “drive by window” of his alleged place of employment is something I must research.