O'Donnell lied re not hearing AR15. Powers did not lie re hearing AR15 (he did not deny hearing AR15).
Both men were incredibly close friends of JFK. O' Donnell was a close family friend of the Kennedy's. Why would he lie?
Neither man reported the AR-15 firing.
Nobody reports the AR-15 firing.
Not one single witness.
Zero evidence the AR-15 was fired.
A theory built on literally nothing.