This is taken right from the Revelation Climax book:
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re chap. 20p. 125 A Multitudinous Great Crowd***
The
Great Crowd Makes Its Appearance17
From the time of the apostle John and on into the Lord’s day, anointed Christians were puzzled as to the identity of the great crowd. It is fitting, then, that one of the 24 elders, representing anointed ones already in heaven, should stir John’s thinking by raising a pertinent question. "And in response one of the elders said to me: ‘These who are dressed in the white robes, who are they and where did they come from? ’So right away I said to him: ‘My lord, you are the one that knows.’" (Revelation 7:13,14a) 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.