Something I don't understand is, why was Provenzano arrested if he was in possession of the mythical black dossier. And didn't Riina also have it? I mean I guess I can understand Riina being arrested but Provenzano quieted things down and they still got to him a decade later.

What's to stop them from arresting MMD despite him having the black dossier if Riina and Provenzano were arrested before him? Isn't the importance of this dossier being overstated?