Didn't get that promotion? Implicit Leadership Theory might be to blame
leadingsapiens.com
leadingsapiens.com
That said, some rulers and bosses are better than others, in a variety of senses. It's not wrong to categorize them and try to figure out how and why they are better or worse, but it is IMO important to try and resist the temptation to adopt the worldview that the word "leadership" drags along with it.