LAL - WRT the IM index. As others have noted, to calculate an accurate IM index you’d need measurements from an actual specimen/bones. The IM index of the “Bigfoot” in the Patterson film is only speculation and based on a single data source/set; there is no other credible evidence to compare it against.
As far as comparisons with other primates, you’ll note I argued against it. Again, without an actual specimen/bones or other credible physical evidence drawing parallels only interjects speculation and clouds the discussion.
“Sightings” are frequently reported in the news….for example from “Bigfoot Sightings” (
http://bigfootsightings.org/bigfoot-research/bigfoot-sightings/)31 MAR 07 a woman alone in the woods encountered a “Bigfoot” (no location given…though as she was walking and not hiking, this would suggest a non-remote area); [date not provided], sighting at Ft Bragg Calif (not a remote area), [date not provided] Highway 96, aka “Bigfoot Scenic Byway” multiple sightings.
Or say the ~2,947 reported sightings in the US and the ~ 207 in Canada, as taken from the BFRO Geographical Database of Bigfoot Sightings (
http://www.bfro.net/GDB/).
US and Canada alone…all those sightings (most between 2000 – 2007) ranging from remote to populated areas, and no credible evidence; no additional footage, no still shots, no bodies or bones, etc. This simply seems inconceivable.