I hazard a guess that you are being thanked because the Zapruder film is generally - and absurdly - treated with kid-gloves on FR.
A President is shot from the wrong direction. This is caught on film. And everyone’s too embarrassed to talk about it because they don’t want to sound like a credulous conspiracy theorist. So thank you for breaking Omerta.
I am not an expert by any stretch of the imagination, but I've been a hunter since knee high to my old Grapndpappy and in my life have seen a few head wounds. All that I can recall had a nice round hole in the side the bullet entered and a large hole on the other side where it exited.
I always wonder why no one ever brings this up?
No, it's just that a lot of us are tired of explaining to the conspiracy minded that what they think they saw on the film is not what they really saw. It old, old old, and like the 9-11 Truthers, facts are no deterrent to the grand conspiracy industry.