Its an interesting question. Wild game is all "grassfed" and offers an n-6/n-3 of ~ 2/1 which seems to be "ideal" (or near to it). That considered these fatty acids ebbed and flowed more as a function of animal protein intake than anything else.
I don't see flax or similar short n-3's as having played a significant contribution to the ancestral diet.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."