I'm responding to the part of the article where Fred opines that a balance is needed, and quiet confidence is probably best. That's helpful to someone whose imbalance is not being quiet enough. But you can be too quiet as well. I think more information is needed to truly find balance.

I think it also comes from the people that you are leading, the organizational culture and the national expectations for behavior. I have a colleague that responds best to aggressive speech, but another that communicates best one-on-one in non-meeting scenarios. Communication can be hard for people who are used to being precise in order to be understood -- sometimes being understood isn't enough. Effective communication goes beyond being understood and extends to the emotional and cultural aspects of the conveyance of the message. The easier it is for someone to listen to you, the deeper your message will penetrate. The problem is that "ease(message)" varies by individual.