Incorrect. ETH postulates that there could be a correlation between gut length and brain development, the paper explicitly states that there could be an alterna

Incorrect. ETH postulates that there could be a correlation between gut length and brain development, the paper explicitly states that there could be an alternative methodology for how we manage the metabolic requirements for our brains. Back to the point on humans having canines. Herbivores also have canines to tear through fibrous plant material see (gorilla, baboon and hippo).