I wasn't there to witness the assassination, so, I have to rely on the evidence of the authorities that did investigate the assassination, and the witnesses that were centered around RFK at the second of his death.
After RFK's speech, he stepped away from the podium, was dangerously walking through a public crowd totally surrounding him, shaking hands with the public.
Witnesses identified Sirhan Sirhan as the only shooter. There was no witness that said anything about a 2nd shooter.
This was a Point Blank shooting. The murder weapon used in the shooting was wrestled away from Sirhan Sirhan's hand by the crowd within just seconds..
My conclusion is that, if there were a 2nd gun or second gunman, SOMEONE WOULD HAVE SEEN IT AND REPORTED THAT DURING THE ORIGINAL INVESTIGATION.
There is no way, in my mind, that a 2nd gunman could have been involved in a dual effort, at the exact PRECISE instant that Sirhan started firing into the body of RFK Point Blank- WITHOUT SOMEONE WITNESSING IT!
There were certainly enough witnesses there.
So , I am not going to even rely upon Ballistics, Bullet Angles, Or number of shots fired
Sirhan Sirhan was able to get off all 8 shots before the gun was wrestled out of his hands, half of the shots being fired in various directions, while the gun was being wrestled out of his hand! Sirhan was able to get off 4 kill shots before RFK's body fell all the way to the ground, and before the good Samaritans attempted to disarm Sirhan. From the time of the first bullet being fired up until the 8th bullet was fired, happened in all of 10 - 15 seconds!
It was fortunate that several others were not seriously shot or killed during the struggle for the gun!