Larry Hancock, a circumspect and dedicated JFKA researcher, is preparing an update on his six-part series on the RFKA, that can be read at
https://www.maryferrell.org/arch/essays/incomplete-justice-1In a nutshell, Hancock posits Sirhan fired live ammo at RFK at the Ambassador, and likely invented (or his defense counsel did) his memory loss non-explanation of what happened that night.
Hancock does not buy the hypnosis tale about Sirhan, and presents Sirhan as a willing, aware, politically motivated assassin.
Hancock, in his pending research, may provide more explanation of Sirhan's background, and who may have been involved with Sirhan.
I have some minor disagreements with Hancock; I think Eugene Thane Cesar likely did not discharge his firearm that night, and was what he appeared to be, only a maintenance plumber and moonlighting rent-a-cop who drew a very unlucky assignment.
In any event, Larry Hancock is always worth reading, and even more, is a gentleman.
Take cues, dudes.