Today a brother said something to me about my opinions of the doctrinal changes and imperfections of the GB. He said "There have been many imperfect men in the past who have made mistakes, but God had no problem using those people". My reply was "Yeah, but how many things have they written in the Bible that are incorrect?"
My point is, just because they didn't understand something, didn't give them an excuse to misenterpret it. If you believe the Bible is inspired, they only wrote what they were told to write. They didn't make any claims. They only made prophecies that maybe they didn't understand. Regardless, they didn't change anything up.