If a single chimpanzee is shown the location of a hidden food item, then that chimpanzee will follow close kin to find the food item. -If a single chimpanzee is shown the location of a hidden food item, then that chimpanzee will lead all other group members to the hidden food to share it.
Natural selection does not always select for the most advantageous traits. For example, some organisms only give birth to one infant at a time, and some animals experience the negative effects of senescence. Neither of these traits seems to make sense in the context of reproductive success and survival.