What skills are central to a Tier III analyst that aren't shared with lower tiers? Is Tier III considered the top?

I have a few ideas knocking around but I wanted to hear from others in those relevant positions.

Is Tier III considered the top and, if not, what is above it? Where does one go if they want to continue to grow technically above Tier III? There are so many articles, presentations, videos, blogs, and discussions about how to become a cybersecurity analyst, what a cyber analyst is, what skills are necessary, and how to progress through the ranks but …

analyst cybersecurity ideas iii knocking skills what is