I don't fully understand the way Stigmata works and how compatibility rate factors into all of it. Granted, I am only on chapter 25. Does the number of Stigmata determine how powerful the Pandora is? This seemed to be the case at the start of the manga, where it was stated that 6 is "elite" level and how all the characters emphasize how Kazuha had 20. But then, we see Rana and Satellizer being able to defeat third-years.
I noticed that Chiffon only has 4, but then you have Rana who has 6. Why is the former regarded as stronger if she has less? Is it possible for someone with 1 Stigmata to be stronger than someone with 5? Also, how does the compatibility rate factor into all of this?
I was hoping someone could just clear this up for me.