Mostly we're hoping to find out if we can e̦̖̗̥a̙̫͍̜̥̰͞t͈̘̳̲ ̦̙t͏̻̠̟̦͚h͏̘̦͈̝e̵̯̪͔̭̺̜̝m̭̳͘

Yeah, that. And sure, to see if these are this world's equivalent to Hollows. They don't sound the same. But!! The same goes for Hollows as your "wraiths". The weak ones are mindless eating machines -- they usually go after their former loved ones first. You know, how when a wife dies and her husband goes a short time later? Ain't just heartbreak. But the stronger the Hollow, the more intelligent it becomes.