x-googlers are expensive. most companies can't afford them. They'd likely need to sell with stock options and IPO prospects
Essentially they want someone they can plop into a dysfunctional team who can help bring things back to a steady state regardless of the issues that are there while keeping everyone happy which is something I've done two or three times.
Rather then butting heads you make demos, convince people, lead by consensus, help put people in charge of sub projects that they can execute on, etc.