When you are early to mid career, it is crucial to look for ways to amplify the good you can do in your workplace and solidify your brand as an individual. To do this, you should be looking, ironically, to elevate others. Doing so is the only way to build a reputation that people are going to actively WANT to talk about (e.g. "oh, having trouble? You should call in Jim, he helped me with a related thing"). This is invaluable.
Perhaps I am speaking through a lens, but had I taken the authors advice and taken a more combative role at such a juncture, I believe I would have far fewer opportunities now.