It's interesting to note that the Watchtower Society, once upon a time, believed it received its spiritual enlightenment from communication with angels. See
http://www.jwfiles.com/angels-transmit.htm
Now it receives enlightenment from necromancy? Revelation: Its Grand Climax at Hand! (1988), page 125, on the other hand, commenting on Rev. 7:13, 14a states: "Yes, that elder could locate the answer and give it to John. This suggests that resurrected ones of the 24-elders group may be involved in the communicating of divine truths today."