It's been said, "The squeaky wheel gets the grease" and " Fortune favors the bold!"
I believe knowing what you're talking about is more important than talking a lot. However it's nearly impossible to be a "silent leader".
Ultimately it all comes down to what one wants out of life. To become a leader, famous, or wealthy one is usually required to step out of the shadows of the "rank and file". They have to be willing to talk to a lot of people, have strong opinions, and be willing to be disliked.
“It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better.
The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming; but who does actually strive to do the deeds; who knows great enthusiasms, the great devotions; who spends himself in a worthy cause; who at the best knows in the end the triumph of high achievement, and who at the worst, if he fails, at least fails while daring greatly, so that his place shall never be with those cold and timid souls who neither know victory nor defeat.”
― Theodore Roosevelt