The original "Revelation its Grand (anti)Climax" contradicts itsself.
One part dealing with the subject says it is Jesus. Later in the book it is Jehovah.
There are several articles in the Witchtower on this. It makes amusing reading. There was one year where the identity flip flopped from God to Jesus and back four times in 6 months!
In the new Anticlimax book, actions formerly ascribed to God are now done by Christ, and vice versa.
In Rev 22 The A&O says "I am coming quickly" it is clear who John thought he is : "Amen, come, Lord JESUS."
da Borg seems to be seriously confused as to the identity of Jesus - a very worrying state of affairs as salvation depends on him.
It is interesting that v6 says The Lord God sent his angel. v16 says Jesus sent his angel. Perhaps trying to ascribe only one person with the identity of A&O is not necessary, as it is a role shared by both the Father and son?
HB