That’s why I qualified my remarks as the ‘basest’ cave man existence. Having hunting partners was in essence, a luxury, and a cave man that had become detached or expelled from his clan would have had no choice but to attempt to satisfy his own needs.
Since cavemen were "pack animals", such lifestyle wasn't a luxury. The technology didn't allow an individual to support himself for a prolonged time. That was more like at war: a machinegunner doesn't trade his fire for a bazooka shot and vice versa. Teamwork instead; so did the cavemen, and their life was like war.