You can’t grill without a fire.
So if you are looking for great ideas, consensus is not the way to go.
You’d better start the fire within your organization.
How much friction are you having at your brainstorming sessions?
Is your team willing to fight for their ideas?
Do people defend themselves (from friction)? Or they stimulate friction?
Make people fight.
Make people fight for their ideas.
And the ideas will fight for you.