@Band on the Run The John who wrote Revelation was not OF the Island of Patmos. That designation was given to him in later centuries. We do know that we was on Patmos at some point (Rev. 1:9). Chances were that he was a slave taken prisoner from the Jerusalem area and traveled through Asia Minor where, upon seeing Christians comfortable with the very Roman power which enslaved him, he wrote letters to the congregations in that area... and a REVELATION. He could have been on Patmos at the time of writing, or it could have been a slave stop-over. Most likely it wasn't an "exile" scenario outside being exiled from Jerusalem (not because of being a Christian). This is also noted in how Revelation is written in really terrible Greek... barely literate.
The "Beast" of Revelation referred to Rome. And this was apparently common among the followers because in the Letter of Ignatius he also refers to Rome as "the beast." You are correct... he had no prophecy in Revelation... he was writing about what WAS... not about what will be.
This all applies to Daniel as well. The book claims to be written in the 500s BCE, but it seems to be written around 187 BCE making it the last of the Old Testament documents to be written... and the writings projected PAST events AS IF it were prophesy. The reason why historians say it was written around 167 is because Daniel, in his four visions, gets everything correct in history... up until the year 164. What he foretold and what happened take a diversion.
King of the North is Seleucid Empire and the King of the South would be some Ptolemy under one of the Ptolemaic Dynasty. His predictions about Ethiopia and Libya were completely wrong (Daniel 11:43), and where he alluded to the Maccabean Revolt, he fails to mention that in 164 BCE Judas Maccabeus re-took Jerusalem and was able to cleanse the temple. This was a MAJOR deal... so much so, the celebration of the temple reconsecration is what we now know today as Hanukkah.
So to following either of these books as WORDS OF PROPHECY is purposefully taking a dive off a cliff into shallow water. The words didn't hold up in their own time, let alone for us 2000 years later... and they STILL cannot be read with any clarity. At what point do you look at someone who says, "No, wait! NOW I have the correct answer!! Trust in me!!" and believe them?
At what point after two millenia do you just say "Look, there are only a finite number of words here in print. If you haven't figured it out by now, there's PROBABLY NOTHING TO FIGURE OUT."