"Rightly dividing the Word of Truth" eh. Such a notion is a bit ethereal. Paul wasn't present at the founding of the Church. The fact that (7+ chapters on) Paul becomes an Apostle with equal, or in your version superior, authority demonstrates even further that there is Apostolic Succession. The New Testament as scripture developed LONG after the twelve Apostles. The idea that the Holy Spirit "taught the Scripture,,,as we have today" is only the invention of men to exalt self.
The Church is the Pillar and Foundation of Truth, not scripture. The Keys of the Kingdom are entrusted to Peter-an APOSTLE, not to scripture. The Spirit is promised in the activities of the Church (ie, Baptism or even gathering) NOT in the scripture(presumably reading it).