Which we only know about because it is written in the letters of the bible ...that who assembled again?
God used Judas, Balaam’s donkey, and Pontius Pilot to work His will. Shall we continue?
It's absolutely irrelevant who assembled the Bible.
Assembling the Bible is no feat of genius. Someone would have done it sometime.
Nor does simply compiling Scripture together in one handy volume by default grant someone the authority or right to interpret it, especially after 2,000 years.
Those people are long dead.
All those churches in Revelation which did not hold true to Christ are no more. Spiritual integrity in the past is no guarantee of it continuing, and based on the sordid history of Catholicism, it didn't.