Sorry for not finding a name, but there's an early hominid (divergent from us, but not an ancestor) that ate C4 grasses and had the jaw shape for it. They are n

Sorry for not finding a name, but there's an early hominid (divergent from us, but not an ancestor) that ate C4 grasses and had the jaw shape for it. They are now extinct. Point being that we can't extrapolate from other species (apes) even if we share an ancestor. Early humans were probably mostly scavengers anyway until fairly close to the agricultural period. Its unlikely they ate much meat.