Stone placement order used to interpet a mesolithic grave in Scotland

[Not rock pile related]  https://www.scotsman.com/heritage-and-retro/heritage/5000-year-old-tomb-orkney-designed-ease-passage-afterlife-research-finds-2964197

I find this interesting as an example of the idea that getting the soul to the underworld might be hard. It seems connected to a belief in ghosts who, presumably, are souls that didn't make it.