Sorry, respectfully snipped for brevity.
About RA's charges - I think kidnapping for murder would be an aggravating circumstance for murder, and the charge would not be felony murder, but much worse. Makes me think that the crime he committed was not kidnapping.
How I personally would view felony murder: case 1: three men broke into a home for robbery; an old owner who happened to be at home, scared, shot one of the robbers. Other two robbers were charged with felony murder of their comrade.
Case 2: something similar happened in my state - a man sold drugs to teenagers; in the process of consumption, one died. That would be felony murder.
Case 3: inspired by Anne Rule's book. A licensed plastic surgeon who performs surgery in office/home and gives anesthesia while having no training of an anesthesiologist; if the patient dies as a complication of anesthesia, this would be felony murder.
So it is when death was not planned and happened accidentally, but the person's whole criminal activity led to someone's death. JMO, but this is how I understand it.
I am thinking of potential versions of how it can be applied to RA's case, given sealed affidavit. (I can bet it will be sealed.) If LE charge RA with felony murder, to me it says that he did not plan murder at all. (Not that the case is weak. It simply says, different circumstances.). No situation of felony murder I am thinking of would explain someone taking something from the CS, signatures, etc. The motive would be very different. So one scenario that could explain all, can't explain any such serial killer-like activity. Anyhow, good luck to deal with this complex case. RIP, girls. Very, very sorry for the mothers.