Royell,
As you know I contend that there where two shooters in that shelter. Having a supposed FBI "Agent" there gives more credence to shooters in the shelter. I do however feel that the person in the film is Mr. Zapruder unless Mr. Bell cut the film and Ms. Sitzman somehow when down the hill. As I stated before, I take peoples testimony with a grain of salt. I rather rely on photographic and film evidence to come up with my conclusions.