May we suggest that an Egyptian sacked the Temple and hauled off the treasure. Try 2 Kings 22 starting with 1 and the word "Josi'ah.
What do you imagine has happened in between to cause such devastation to the House of the Lord (i.e. The Temple) to require major repair, and why are these people down to ONE REMAINING COPY OF THE LAW?
BTW, they not only had only one copy, they had a hard time putting it all back together! That meant that the entire caste of men who memorized the entire Torah had disappeared.
Might we suggest that the Egyptians had come in, smacked them down, hauled off the loot, and then disappeared leaving the Jews alone in their little part of the world.
This all happens before the Babylonian devastation.
You may suggest anything you like, just as long as you prefix everything with, This is my suggestion. This does NOT IN ANY WAY MAKE IT FACT. I get my information from the Word Of God - the Holy Bible - The INSPIRED Word Of God. And if I had to choose which one I would believe it would be no contest. Your's are mere subjective suggestions that are slanted to YOUR VIEWPOINT which would make your philosophy of religion harmonious to your belief system. I base mine on what MY God has related to me in HIS HOLY SCRIPTURE.