Rome itself is very deviate from the NT church, regardless of a form of magisterium, while SS does not make the individual the supreme authority, as it uphold the principle of magisterial authority based upon Scriptural substantiation, which is how the church began, not under the premise of obedience to an autocratic infallible magisterium.
And which Rome has infallibly declared she is when speaking according to her infallibly declared *scope and subject-based) formula. Thus all that she enlists for support can only mean what she says it means.
In addition, it is Rome that makes the individual the supreme authority, that being an assuredly infallible pope as supreme over councils, which most Catholics seem to believe he is.
Dear Daniel. The Church preceded the New Testament and which New Testament was written by Catholics to other Catholics in an already existing nascent Catholic Church.