Personally I have never found it necessary to concern myself with the nine until this subject came up here. That being said it is obvious that if one listens to the SSPX side of things only, you are getting but a small part of a larger story.
Much the same as the Menzingen side of the resistance story. Resistance to what? No issues here just a group of disobedient, sedevacantist leaning priests who rebel against authority. Sounds eerily familiar to the refrains about the nine way back when.