This all sounds good, but the actual narrative (if you want to call it that) was that the bullet hit CK's body armor on upper left chest where much energy was dissipated and you can see his shirt lift from this. The ricocheted bullet then went into his neck from there. This slowed down bullet then didn't exit even. To add to this the raising of the right arm and twitching up to the left is an automatic nervous reaction when the upper spinal cord / lower cerebrum (brainstem) is severely injured or severed and this most likely killed him immediately right then. I have yet to see theory that answers things as simply as this. I'm not discounting other possible "potential" shooters, but the "narrative" appears to be simply the facts at this point.