''Last men standing''

When ever there's group work, what people hate is when they are chosen last by the group leader. The person will feel disown, disoriented and unworthy. Sometimes, it's not that others are smarter, just that you have little chance to prove to others of your capability.

For a group leader, it's a nightmare if all your teammates are slackers, you'll have to do everything yourself. Likewise, if the group leader is weak, the team members will suffer, worst if the groub has only two members.