It's quite obvious what's going on here.

If you look at the first photo, it is quite obvious that it is a book depository:



Or is it?

This series of pictures shows what we all can agree is a grassy knoll the day of the shooting.



This is the same grassy knoll as it looks today.





Now looking at this overview one thing becomes quite clear to everyone:



Brian was the lone gunman in the Kennedy assasination.