I just wonder how fast the game actually collects the corpses and can it be helped in any way. For example, corpses of dragons, vampires and locals in Riften get removed pretty quick. But corpses of cultists or locals in Riverwood seem to be lying around forever.
I find it silly that Sigrid talks of Alvor in a missing way weeks after he was killed by a dragon, and there he still lies, at the ground surface in lumber mill. No one ever buried him.