It's not about the numbers, but about the truth.
The principle of sola scriptura is clearly affirmed in verses as acts 17:11 which commends the Berans for testing doctrine taught by Paul, using Scripture. Sola scriptura is also implied in 1 Cor 4:16, where Paul warns the church not to 'go beyond what is written.' In addition, Jesus Himself criticized those who used tradition to set aside Scripture in Mark 7.
Sola scriptura is not so much an argument against tradition as against unbiblical and extra-biblical doctrines. The only way to know for sure what God expects of us is to stay true to what we know He has revealed in the Bible. We can know, beyond the shadow of any doubt, that Scripture is true, authoritative, and reliable. The same cannot be said of tradition.
Acts 17:11 teaches the exact opposite of sola-Scriptura as I explained in post #11.
The Bereans accept the ORAL proclamation of the Gospel and choose to believe that the person of Jesus Christ had died and risen from the dead, a fact which could not be verified in Scripture at all. If they were "scripture alone" they would have had to reject this teaching.
As far as Paul's warning in 1 Cor 4:16 to not go beyond "what is written", that is a most interesting verse. As with all things, context is key. Those who try to use it to mean that one should only believe or teach things that are found in Scripture are way off the mark because that simply isn't the context. At all. It's talking about who is saved.
"Therefore do not pronounce judgment before the time, before the Lord comes, who will bring to light the things now hidden in darkness and will disclose the purposes of the heart. Then every man will receive his commendation from God. I have applied all this to myself and Apol′los for your benefit, brethren, that you may learn by us not to go beyond what is written, that none of you may be puffed up in favor of one against another.” (1 Corinthians 4:5-6)
The other thing that's most interesting about this verse, throughout his writings when Paul is speaking about Scripture he uses the Greek word
graphē consistently when he’s referring to Sacred Scripture (Romans 1:2, Romans 4:3, Romans 9:17, Romans 10:11, Romans 11:2, Romans 15:4, 1 Corinthians 15:3, 1 Corinthians 15:4, Galatians 3:8, Galatians 3:22, Galatians 4:30, 1 Timothy 5:18, 2 Timothy 3:16). The word Paul uses for Scripture is found nowhere in this text however. It's suspiciously missing. Why is that?
Sometimes we can be so fixated on what we think we know, we can miss the point. Why did St. Paul not use the word Scripture here?
Hint, the context is about whether or not a person is saved, St. Paul tells them not to go beyond what is written, and when the Lord comes he will pronounce judgement and bring to light things now hidden.
And I saw the dead, great and small, standing before the throne, and books were opened. Also another book was opened, which is the book of life. And the dead were judged by what was written in the books, by what they had done. And the sea gave up the dead in it, Death and Hades gave up the dead in them, and all were judged by what they had done. Then Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire; and if any one’s name was not found written in the book of life, he was thrown into the lake of fire. (Revelation 20:12-14)
See also Philippians 4:2-3, Revelation 3:5, Revelation 13:7-8, Revelation 17:8
Context -- people are starting to brag about who is and isn't saved. Paul's answer -- there's no pronouncing judgement until the Lord comes. So don't go beyond what is written. What writing tells us about who is saved? The Lamb's book of Life.
That passage has nothing to do with Scripture much less proves a doctrine of Scripture alone for knowing and teaching the faith.