JBR's neck? He apparently took the time to wipe JBR.......so why wouldn't he remove the garrote and take it with him, like the duct tape and stun gun?

I think the perp was quite proud of the note----tying in all those movie lines and themes....with a crime perhaps based on Ransom and Ricochet. Role-playing is still a possibility, IMO....and don't forget some of the video games give points for killing with a garrote.