Quote - The Web Master has to be hired by the site
Wouldn't the webmaster/ top site admin be the one who hires everyone else?

This depends on the company and varies one company to the next.

In mine, the Webmaster does server configurations, and traffic work.  He has no hiring power, but has extensive power over how the servers operate, and what runs on them.

My team does the actual building of the front end of the website, and have an entirely different management structure.  We have control over the HTML, CSS and JS that power the site, and no control over the boxes that code runs on, or the back end code that interfaces with the Database.