That’s amusing, but Kuru and Creutzfeldt-Jakob disease are both killers, and both result from cannibalism (I think many people learned this from The X-Files).
Yeah, but those diseases are attacking the namby pamby modern humans. I ‘spect those original progenitors were made of sterner stuff. Eat a hominid for lunch without even a burp.
And I know you don’t want to go to the other theory to explain the major jump from ape to homo sapiens—Ancient Aliens.