It is a good thought, but I would like to add, that even in pure hunters societys, you also had different professions. You need to process and store the meat and fur, make the tools, heal wounds, help with births, praise and sacrifice to the gods and spirits (lets assume they do, most if not all native tribes do so), think about neighbour tribes, inner rivals, mating ... so I am basically just nitpicking that not EVERY intellectual capacity avaiable did go to hunting ..