I don't know about that bit, I would not expect raving delusionals to write within a well established literary genre which included canonical books like Daniel and Ezekiel as well as later books like Enoch, Jubilees and 2Esdras. Even Jesus seems to have recognised the legitimacy of the apocalyptic title Son of Man and appropriated it as rightfully his. (Yes there was also a long established use of 'son of man' to mean ordinary mortal, but that would not have been quite so controversial.)
At the same time, we had church fathers like Crystostome wanting to exclude Revelation from the canon, and into the 9th century it was still considered one of the 'disputed books'. Martin Luther wrote about it in his 1522 preface to the book "About this book of the Revelation of John, I leave everyone free to hold his own opinions. I would not have anyone bound to my opinion or judgment. I say what I feel. I miss more than one thing in this book, and it makes me consider it to be neither apostolic nor prophetic. First and foremost, the apostles do not deal with visions, but prophesy in clear and plain words, as do Peter and Paul, and Christ in the gospel. For it befits the apostolic office to speak clearly of Christ and his deeds, without images and visions. Moreover there is no prophet in the Old Testament, to say nothing of the New, who deals so exclusively with visions and images. For myself, I think it approximates the Fourth Book of Esdras (2Esdras); I can in no way detect that the Holy Spirit produced it."
Doubting the authenticity of Revelation is a long established tradition in the church. But personally, I love the book of Revelation, it is the perfect completion to a bible that starts of with another allegory of a newly created earth and heavens, a marriage, paradise, a serpent and a tree of life.