Individual wrote: . . . then it is only natural that surviving will consume every part of what it is to be human.
This is the crux of the biscuit for me--i can easily imagine even the most primitive existence entailing leisure time. I am not completely Hobbesian about the "state of nature," and as well, i would point out that Hobbes contends that leisure is the mother of philosophy. Given that we know nothing, including how much we may know, of the mental processes of animals--they may indeed have leisure and philosophy as well.
None of which leads me to conclude that there is either a remnant of being after death, nor a revenant.