What we disagree on is your definition of “definitive scriptural proof”
what it really comes down to: is that you don’t accept theses verses
1 Cor 4:6
6Now, brothers, I have applied these things to myself and Apollos for your benefit, so that you may learn from us the meaning of the saying, "
Do not go beyond what is written." Then you will not take pride in one man over against another.
Luke 1:1-4:
1Many have undertaken to draw up an account of the things that have been fulfilled[a] among us, 2just as they were handed down to us by those who from the first were eyewitnesses and servants of the word. 3Therefore, since I myself have carefully investigated everything from the beginning, it seemed good also to me
to write an orderly account for you, most excellent Theophilus,
4so that you may know the certainty of the things you have been taught.
In Matthew 4:1-11. Three times Jesus was tempted by the Devil and each time Jesus replied exactly the same three dangerous words that defeated the Devil: “IT IS WRITTEN” If any one could have used oral tradition, it was Jesus, yet he chose the only safe and sure way to defeat Satan: Scripture.
Mark 12:24
24Jesus replied, "**Are you not in error because you do not know the Scriptures **or the power of God?
2 Timothy 3:15
15
and how from infancy you have known the holy Scriptures, which are able to make you wise for salvation through faith in Christ Jesus.
Yes, it can be understood by children
1 John 5:13
13 **I write these things **to you who believe in the name of the Son of God
so that you may know that you have eternal life.
2 Timothy 3:16-17:
16All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, 17so that the man of God may be thoroughly equipped for
every good work.
No matter how you twist it, it still says that scripture alone is all-sufficient to equip us for EVERY good work*
Luke 10:26
What is written in the Law?" he replied. “How do you read it?”
Jesus expected even his enemies to correctly interpret the Bible by simply reading and studying it.
Acts 17:11-12
11Now the Bereans were of more noble character than the Thessalonians, for they received the message with great eagerness and examined the Scriptures every day to see if what Paul said was true. 12Many of the Jews believed, as did also a number of prominent Greek women and many Greek men.
Even though the apostles were inspired with genuine oral revelation, they always directed people to the scriptures for the final determination of truth.
Deuteronomy 4:2
Do not add to what I command you and do not subtract from it, but keep the commands of the LORD your God that I give you.
Etc etc
bible.ca/sola-scriptura-proof-texts.htm