Cynthia is the Seven's Eye, and Yuma was just the weakest surviving warrior of the Battle of the North (since Clare was far stronger than her rank at the time). Her purpose was finally shown. She realized how much stronger she is now, so compare her to the others where the gap hasn't shortened and we get the idea of what kind of monsters Clare and the others have become. She also had some purpose in developing Clare's character several chapters ago. She's more of a gauge and a plot device than any special role within the Seven.

In fact, other than Cynthia, the others are just really strong fighters. They don't have any special titles.

I'm sure with Miria's revalation a few chapters back, it's more that the Organization just doesn't give a shit about when their Claymores Awaken. It helps in their research. The girls have their own code about killing themselves before they turn into "yoma" (a myth long debunked and something the higher-ranked Awakened Being Hunters have full knowledge of), but just because they have an agreement among each other doesn't mean their handlers truly care. It just makes the claymores easier to handle.