Try this "mind experiment".
There is a very large sports stadium the size of Texas. Inside this stadium there are four enormous crowds of people. They are all believers in Jehovah God and think of their religion as the Truth exclusively.
Group Number One are all the people who read and believed the teachings of Charles Taze Russell.
Group Number Two are all the people who came along after Judge Rutherford became President of the Society.
Group Number Three are the JW's under Nathan Knorr up to the year 1975.
Group Number Four are all the Jehovah's Witnesses post 1975 up to today.
Now here is the experiment. How many things do these vast groups of millions of Jehovah's true believers AGREE UPON AS THE TRUTH?
What kind of arguments would they have?
How would they settle those arguments?
Interesting, no?