It remains that what you failed to answer is your premise"that unless one cannot show formal descent from the historical magisterium but dissents from it, then such necessarily cannot have validity? And that being the historical instruments and stewards of Divine revelation (oral and written) means that such is that assuredly infallible magisterium. Thus any who knowingly dissent from the latter must be in rebellion to God."
Since that must be your argument, you might as well make that clear.