I'm not talking about the 'matter',as you say it's just rotting meat, what about the 'electrical' (?) spirit... as in the debunked Spiritism.
So the Bunko artists (Mediums) can't 'communicate' but It's possible the 'Energy' is still there looking for a new host...
Which might explain the alleged Ghost sightings?
I thought you were talking about the kind of rebirth Buddhists believe in. They don't believe in souls and they think we are all one and after death you become another being (your matter gets recycled). I've got nothing to say about your view except that it is unlikely that your memories and personality remain after death. Brain damage can make you lose your memory, the ability to speak English or to recognize faces, and yet people think that after the brain dies completely (when you die) your memories remain unscathed.
I think that human gullibility explains ghost sightings.