I read a book about death once. It talked about death being a river, and the souls went along the river through various gates until they were finally dead. It’s a nice idea, but doesn't account for Reapers at all. From what I see, death is where a streem joins a lake. Some souls just go straight on in but some people get stuck in an eddy and have to go round a couple of dozen times before they can go through.
Maybe Rupe knows why some souls so through and others don't. If he does, he's sure not telling me.