Then must it be discarded? Acts says that Judas was succeeded. The Fathers and history says the rest of the Apostles were also succeeded. Are you saying it really never happened or that you know it was against the will of God?
The Word of God IS infallible ...please use that as your source if the point is to prove the proof of a doctrine
But you just ignore any words of God that you disapprove. The Gospel of John says that many of Jesus' teachings were not written in Scripture and Paul says we must "hold fast" to the spoken Apostolic traditions. Why aren't these doctrines infallible?
Everything God INTENDED us to know of the life of Christ is written so we may believe..
Making doctrine out of silence is not an infallible process.. it is nothing more than guess work and the dreams of men
Remember when Paul spoke there was no "NT" as such.. the "traditions " have since been recorded in the scriptures
Col 2:8 Beware lest any man spoil you through philosophy and vain deceit, after the tradition of men, after the rudiments of the world, and not after Christ.