Most great leaders are great communicators. No matter how great your ideas. Your technical skills. Your decision-making skills. If you can't convince other people your idea makes sense, if you can't convey how a project or initiative will generate a return, if you can't explain the logic and benefits of a decision... then you're unlikely to harness the power of the people around you.
https://www.inc.com/jeff-haden/why-most-effective-leaders-embrace-rule-of-but-therefore.html