I remember a long time ago the explanation was that various anointed ones would write to the GB with the same new understanding of a teaching, the GB would investigate it, and if it was acceptable, they'd pass it on to the R&F.
Of course, now we have the new light that new light occurs only to the GB, not the anointed at large. So, if any anointed ones get new ideas, they're just apostates, right?
And what about the fact that in receiving new light they're communicating with the spirit world? How do they know it's from Jehovah, not Satan? 
And why did I ever believe that a bunch of old men in Brooklyn had a direct line to Big J? 