It wasn't a backport. You see it as such because you are looking back at it. What is being suggested is that they knew all along.
Let me ask you again:
1. Do you have or are you pursuing a degree in theology or history?
2. List your sources, as in, list the references YOU own and have read and studied.
My own answers to the above,
1. I have begun pursuing education in scholarly studies, in hopes of becoming s New Testament scholar.
2. Daily Life in the Times of Jesus by Henri Daniel Rops - owned, studied.
Lord Jesus Christ, Devotion to Jesus in Earliest Christianity by Larry W. Hurtado - owned, studied
The Oxford History of the Biblical World, edited by Michael D. Coogan - owned, currently studied to page 265.
The History of the Hebrews by Frank Knight Sanders - owned, studied (slightly aged)
Jesus and the Eyewitnesses by Richard Bauckham, owned
A copy of the bible in each of the following translations: KJV, NIV, NASB, and of course NWT. Each owned and studied with notations from start to end, containing references to Strongs hebrew and Greek index. - all owned, all studied separately and completely.
The New Strong's Expanded Exhaustive Concordance of the Bible by James Strong. Owned, used as reference tool
Vine's Complete Expository Dictionary of Old and New Testament words by W.E Vine. Owned, used as reference tool
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i have studied more books, but as pertaining to this thread, only these have been called on by memory.
please provide the names of the sources you actually own, and have studied yourself.