Democracy is bullshit.
Democracy is the best we've come up with for running a country, but this isn't a country. You can enter or leave any time you want. And since the project is open, if you disagree with the leadership, you can fork it and try to do better, and let the marketplace of ideas decide.
One person (Gen?) or a very small group of people should have absolute authority. The role and responsibility of a good leader, then, is to demonstrate to everyone else that that authority is well-placed; that their judgment, insight, taste and just plain good sense can be trusted. This is a very difficult task to live up to and requires an excess of self-awareness and self-doubt. It's, frankly, a huge pain in the ass, and not for everyone.
The most important role of a leader at Retro is probably to settle debates on details and provide canonical answers before the debate stops being productive. This is where having trustworthy judgment and taste comes in.
“If you want to build a ship, don't drum up the men to gather wood, divide the work and give orders. Instead, teach them to yearn for the vast and endless sea.”
The only way to succeed with a volunteer project like this is through mutual trust, respect, and dignity, with a focus on building something beautiful. This can't be forced; it can only be nurtured. Everyone should bear that in mind.