I'm sure you've all worked some place that talked about 'meritocracy'. I'm sure most of you have worked some place where every time a promotion happens, people joke about "I thought you were already a ".
Years ago someone put me onto this phenomenon. Some people in a business have no trouble making decisions and others are hesitant for a myriad of reasons, from self doubt to not wanting to be responsible for the consequences, to just not liking being randomized. These people will line up behind folks who seem confident, and as this manager half-joked, all he really had to do was 'show up' and start making decisions and people would follow him.
The best description I've ever heard of this phenomenon, and describes my own experience, is that people are looking for and will line up behind someone they can trust. If you sound confident they will give you the benefit of the doubt. But if things go wrong and you don't jump on the problem, they get burned and they won't listen to you as much in the future, even if you are ostensibly in charge. Strong opinions loosely held, own your mistakes, be good at troubleshooting, talk to other teams (even knowing things an hour before everybody else makes you look a hell of a lot smarter), and people will defer to you even without a title. Because even if the boat goes down they know you'll go down with it instead of running away. People will take your advice, rank be damned.
That said, there are darker patterns here too, that could easily dominate in a 'flat' organization. Hoarding knowledge forces people to defer to you. There are obvious flavors of this that I don't need to explain, but here's one I see all the time but others miss: modelling systems to exactly reflect your mental processes (instead of a simplified version, see Brian Kernighan on debugging) means nobody else can work on it except for trivial things. This makes people feel stupid, and imposter syndrome stops them from fighting back.
As one of my bosses said, you should fire all of the 'indispensable' people because they are holding up progress. An earlier boss started a new project and wouldn't let a bunch of us work on it because we were 'too important' to the old project. I think maybe 2 of us figured out this was a trap and worked to hand off our stuff.