> they would possibly hunt more efficiently, using tools and having a better memory for migration routes, they would have a better memory for dangers etc. Sure

> they would possibly hunt more efficiently, using tools and having a better memory for migration routes, they would have a better memory for dangers etc. Sure, but those reasons aren't enough. The world has to change often enough to make that 0.001% smarter brain have an actual advantage. And slow enough that there is no extinction event. Judging by what we see nowadays, 13.8 billion years don't seem enough for those odds. Unless the intelligence increases where such big leaps, and became the strongest dominant genes, that it didn't really matter how much time passed or how the world changed?