Ranks are expressed by comparing the position of concepts within the whole view: upper, broader and-or most wanted or brighter are ways to identify ranking. Ranks do exist to our natural reason since i.e. we are more afraid of death than of worry, we are more likely to like to be more often happy than being sad the majority of our time. So ranks are basically finally expressing how much bright should deserve each vibration in life compared to another.
But despite its rank and this following affirmation that will posible be very polemic to our reasoning: every vibration is relative to the rest of others, so ranks are perceptions and not strict hierarchies i.e. death is not universally worse than worry, being sad is not less important than being happy, etc.. . Nevertheless, and as said above, ranks do help us understand the and what matters most than other matters in our life.