It has been suggested that the mother of one of the case players might have died 3 weeks ago. IF SO---could that be why great grandfather and family friend came to the national park? Did they come to scatter the ashes? That would be very interesting if it happened that way.
That's very plausible. And maybe the "empty/ EMT" bag was used to transport the cremains; and the mother did not want to talk about that bag, because it would just confuse things?
Great speculation. Both very plausible.