On one hand, it's a good sign that you have a keen sense of what you need to know, how and where to look for it, and at what pace. On the other hand, authors who know more about a subject than you do must have had their reasons to choose the order in which they present their material. I'd say keep listening to your gut on what is important to read, but at least try to get acquainted with the other topics you're choosing not to go deeply into.