It's a truism (Aikido and elsewhere) the most vocal about reform are those outside of the structure.
Martin Luther would seem to be a counter-example.
He was well within the Roman Catholic Church State when he posted the 95 thesis on Wittenburg Castle-church doors on
October 31st 1517, Wittenburg, Germany. He was the most vocal in his time when it came to Reform. What followed was the Protestant Reformation, and the beginning of modern civilization.