There is possibly some method to the madness. Watching reactions of others under investigation when someone's name is released upon arrest may tip off police to step up inquiries or may confirm suspicions in some way. The investigation seems to consist of reopening of old cases or files in the light of new allegations and there are probably lots of names with question marks after them now being combed through.
Its curious how both mc and jd both spoke about "witchhunt" and said about things being different in the 70's kind of rhetoric. Makes me wonder if it was an attempt to hide in plain sight? One of them has always boasted how he is able to lie convincingly, that sort of thing will not stand in good stead if things are taken further etc.