Goober had to have been making good, even crucial, use of his mental abilities or we would not have ours. So, what the heck was Goober doing with his abilities

Goober had to have been making good, even crucial, use of his mental abilities or we would not have ours. So, what the heck was Goober doing with his abilities that were crucial? He found the cave, kept out animals that could hurt him, built a fire to keep it warm, built families, found food and water, make tools, weapons, and clothes, etc. Apparently found good uses for his brain.