Reformed Protestants may be a tad hung up on Scripture, though it is supposed to be the very word of God. But if you begin to waffle on that canon notice how you begin to add to the authoritative texts.
For Roman Catholics, the doctrine of development has a hard time nurturing content with the Bible (even including the Apocrypha):
The deepest reason for the identity of Revelation in its ecclesial continuity is given in the hypostatic union, i.e., in the unity of the human and divine natures in the one divine person of Jesus Christ. The many words he spoke, revealing God’s plan to us through the medium of human language (cf. Joh 3:34; 6:68), are united in the hypostasis or person of the one Word that is God and has become flesh (cf. Joh 1:1, 14). The Word of God comes to us through the preaching of human beings (cf. 1 Thess 2:13); it is made present through human words, with their grammar and vocabulary. Therefore, it is possible and necessary to grow individually and communally in our understanding of the revelation that has been given to us once and for all in Christ. It is clear, then, that Catholic theology has always recognized the fact and necessity of the development of dogma. It is part of Christianity’s essence as the religion of the incarnate Word—the religion of God’s self-revelation in history—to affirm the identity of the doctrine of the faith along a continuous process by which the Church comes to an ever more differentiated conceptual comprehension of faith’s mysteries.
Make of that what you will about the potential problems of development but here you see an affirmation of continuity between the incarnation, divine revelation, and the ongoing revelation of divine truth in the doctrines of the church. Finding a distinction there between the prophets and apostles, and the teachings of the bishops and councils becomes fairly murky when the word incarnate, the word inscripturated, and the mystical body of Christ (the church) are all pieces of ongoing understanding of truth.
Unfortunately, it seems that Lutherans have a similar problem distinguishing between the apostles and the church’s theologians or pastors:
From a very practical standpoint, we have, as Lutheran pastors sworn to uphold the theology of the Book of Concord of 1580, also consequently, committed ourselves to the hermeneutic of reading the confessions we find in the Formula of Concord, and that is, if ever a question arises within the Lutheran church, the writings of Luther are to be consulted for the answer. In other words, the confessions understand themselves not to be so much a theology in and of themselves, but a summation of Luther’s theology:
“Since Dr. Luther is rightly to be regarded as the most eminent teacher of the churches which adhere to the Augsburg Confession and as the person whose entire doctrine in sum and content was comprehended in the articles of the aforementioned Augsburg Confession and delivered to Emperor Charles V, therefore the true meaning and intention of the Augsburg Confession cannot be derived more correctly or better from any other source than from Dr. Luther’s doctrinal and polemical writings.”
Thus the confessions are not the bottom of a theological well from which Lutheran theologians thereafter would draw, but instead the confessions are the peak of the mountain, the mountain which is the theology of Martin Luther. But if that mountain remains unknown to us, how then are we to understand our task as pastors today in view of the Lutheran confessions?” (Paul Strawn, “Rediscovering the Theology of the Small Catechism, i.e. Martin Luther”)
Luther was great and is always edifying to read. But he did not approach salvation by following a great theologian, unless you consider (as some do) Paul the church’s first great theologian. Here, though, Paul had an advantage over Luther. He was infallible.