There are a handful of minor discrepencies, but you must remember that almost all of the Councils were called as a result of developing heresies.
So when Nahum says things like: "Thus saith the Lord..." and "the Lord hath given a commandment concerning thee..." and "Behold, I am against thee, saith the Lord of Hosts.", he was pretending to speak for God and it ended up IN THE BIBLE ANYWAY???!!! The words of Almighty God are throughout the entire Bible and are all there for a purpose. The fact that Jesus himself says "It is written." so many times proves he accepted them and we can do no less.
A fair question. Let us turn to Nahum for illumination.
Nahum 3: 1 Woe to the bloody city, all lies, full of plunder, whose looting never stops! 2 The crack of the whip, the rumbling sounds of wheels; horses a-gallop, chariots bounding, 3 Cavalry charging, The flame of the sword, the flash of the spear, the many slain, the heaping corpses, the endless bodies to stumble upon! 4 For the many debaucheries of the harlot, fair and charming, a mistress of witchcraft, Who enslaved nations with her harlotries, and peoples by her witchcraft
Let us compare Nahum with Jesus:
Luke 22: 17 Then he took a cup, 6 gave thanks, and said, "Take this and share it among yourselves; 18 for I tell you (that) from this time on I shall not drink of the fruit of the vine until the kingdom of God comes." 19 7 Then he took the bread, said the blessing, broke it, and gave it to them, saying, "This is my body, which will be given for you; do this in memory of me." 20 And likewise the cup after they had eaten, saying, "This cup is the new covenant in my blood, which will be shed for you. 21 "And yet behold, the hand of the one who is to betray me is with me on the table; 22 for the Son of Man indeed goes as it has been determined; but woe to that man by whom he is betrayed." 23 And they began to debate among themselves who among them would do such a deed.
24 8 Then an argument broke out among them about which of them should be regarded as the greatest. 25 9 He said to them, "The kings of the Gentiles lord it over them and those in authority over them are addressed as 'Benefactors'; 26 but among you it shall not be so. Rather, let the greatest among you be as the youngest, and the leader as the servant. 27 For who is greater: the one seated at table or the one who serves? Is it not the one seated at table? I am among you as the one who serves. 28 It is you who have stood by me in my trials; 29 and I confer a kingdom on you, just as my Father has conferred one on me, 30 that you may eat and drink at my table in my kingdom; and you will sit on thrones judging the twelve tribes of Israel.
31 10 11 "Simon, Simon, behold Satan has demanded to sift all of you like wheat, 32 but I have prayed that your own faith may not fail; and once you have turned back, you must strengthen your brothers." 33 He said to him, "Lord, I am prepared to go to prison and to die with you." 34 But he replied, "I tell you, Peter, before the cock crows this day, you will deny three times that you know me." 35 He said to them, "When I sent you forth without a money bag or a sack or sandals, were you in need of anything?" "No, nothing," they replied. 36 He said to them, 12 "But now one who has a money bag should take it, and likewise a sack, and one who does not have a sword should sell his cloak and buy one. 37 For I tell you that this scripture must be fulfilled in me, namely, 'He was counted among the wicked'; and indeed what is written about me is coming to fulfillment." 38 Then they said, "Lord, look, there are two swords here." But he replied, "It is enough!" 13
39 Then going out he went, as was his custom, to the Mount of Olives, and the disciples followed him. 40 When he arrived at the place he said to them, "Pray that you may not undergo the test." 41 After withdrawing about a stone's throw from them and kneeling, he prayed, 42 saying, "Father, if you are willing, take this cup away from me; still, not my will but yours be done." 43 14 (And to strengthen him an angel from heaven appeared to him. 44 He was in such agony and he prayed so fervently that his sweat became like drops of blood falling on the ground.) 45 When he rose from prayer and returned to his disciples, he found them sleeping from grief. 46 He said to them, "Why are you sleeping? Get up and pray that you may not undergo the test."
47 While he was still speaking, a crowd approached and in front was one of the Twelve, a man named Judas. He went up to Jesus to kiss him. 48 Jesus said to him, "Judas, are you betraying the Son of Man with a kiss?" 49 His disciples realized what was about to happen, and they asked, "Lord, shall we strike with a sword?" 50 And one of them struck the high priest's servant and cut off his right ear. 51 15 But Jesus said in reply, "Stop, no more of this!" Then he touched the servant's ear and healed him.
I think that the words and deeds of the Incarnate Son of God are a tad elevated above the minor prophet Nahum.
I'm not exactly sure what you mean by "elevated". Certainly, you realize that the "Gospels" were written at a later date than most of the epistles. The teachings of Jesus were told and retold verbally for many years prior to them being written down for posterity. Paul, for example, learned not only from the followers of Jesus what he spoke but from Jesus himself. So, in that case, what Paul wrote WAS the word of Almighty God just as the case of the writers of the Old Testament including Moses and the prophets (major and minor ones).
I assume your point in stressing this "preeminence" of scripture is to try to prove that what is written that Jesus said overrules any subsequent revelation written in Scripture and, if this is your point, I strongly disagree. Just as your church teaches progressive knowledge, there was progressive revelation. What was revealed as truth to the early Christian church was new compared to what had been spoken of before Christ came. Different audience, different covenant, different purpose - but still the truth God intended to be made known and which he has preserved even until this very day. And God does not contradict himself. It is often our own misinterpretation that causes the conflict. God's word is truth - He knew what He was doing when He entrusted mere men to record his truth - and He ensures its protection from error.