Um... there are no "grey Jedi". A Jedi is an adherent to the Jedi code, which neither Jolee nor Kreia were. When people stop following the Jedi code, they become fallen Jedi, darksiders, or something else. They are not "Jedi" anymore. As "Jedi" is for all intents and purposes a religion, once one stops believing in the tenets of the religion, and stops acting on those beliefs, one is no longer "Jedi".
Jolee is more like a fallen Jedi, meaning he just does things his way. Kreia is just a crazy old wench, but she never claims to be Jedi or Sith. She's just crazy.