When I read Revelation 21-22, I am reading the "rest of the story." The beginning of the story is found in Genesis chpts. 1-3. Finally, all the wrongs in the first garden are being made right in the final garden.

Since Christ is the judge and king, very likely he is the member of the Godhead that OT saints would stand before.

"When [the Lamb] opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained. They called out in a loud voice, 'How long, Sovereign Lord, holy and true, until you judge the inhabitants of the earth and avenge our blood?' Then each of them was given a white robe, and they were told to wait a little longer, until the number of their fellow servants and brothers who were to be killed as they had been was completed" (Revelation 6:9-11).  

The word endure means to stand firm, and that is the theme of this book. We are to stand firm. We’re not to be carried about by every wind of doctrine theologically