Leadership is not about giving orders, but about inspiring others to achieve a common goal.
You could be the most beautiful person in the world and everybody sees light and rainbows when they look at you, but if you yourself don't know it, all of that doesn't even matter.
It’s possible that a not-so smart person, who can communicate well, can do much better than a super smart person who can’t communicate well. That is good news because it is much easier to improve your communication skills than your intelligence.