Any communication by God is revelation. If and when the Governing Board claims "light," they're essentially saying they're receiving revelation, just as the ancient apostles received it. I've often wondered what the members of the GB would do if they actually ever met any of the ancient apostles. Would they consider themselves equal?
And other sheep I have, which are not of this fold: them also I must bring, and they shall hear my voice; and there shall be
one fold, and one shepherd. (John 10:16)
The whole thing about the "other sheep" saying in John 10 is that the leaders have completely contrived what it means to fit their own theology. Most sectarians believe the other sheep are the Gentiles. After all, it was uttered before the gospel was carried to the Gentiles. Recall that the Lord said specifically that this other fold would "hear my voice." Also that there would be one fold and one shepherd. Yet the JW leadership stress that this other fold is an eternally separate one!
Perhaps the Gentiles are the other sheep. Or perhaps they refer to a group of believers elsewhere on the earth that the Jews didn't know about.