Yes, the WT really pulled that one out of.... I always wondered why 666/616 was stated to be "a man's number", and why the number meant "imperfection", when it was supposed to refer to Satan. But I was still shocked to discover that the writer may have meant this phrase literally -- that it was a number that referred to one specific man.
Another interesting point is that the count of caesars at the rough time period of Revelation's writing corresponds closely to the number of past kings mentioned in the book. Here's a handy list. Augustus, Tiberius, Caligula, Claudius, and Nero were definitely the first five caesars, spanning from 27 BC to 68 AD. Right after the noteworthy verse mentioning the seven mountains (which are theorized to be the 7 hills of Rome) in Rev. 17:9, it says in vs. 10 that "five [kings] have fallen, one is, the other has not yet arrived, but when he does arrive he must remain a short while". There is also a wild beast who "was but is not" and who returns to bring destruction with him, in vs. 11. This is thought to refer to the feared return of Nero, as you have probably read about.
It's difficult to say who Revelation's sixth and seventh kings after Nero (and before Nero's return) would be, owing to the confusion of the Year of Four Emperors, 69 AD. Was the book written during the short reign of Galba, Otho or Vitellius? Because they did remain only a short while, as the king after the present one was supposed to. Or did Revelation's writer ignore those short-lived rulers, instead counting Vespasian as the next caesar after Nero, since he had a solid reign from 69-79 AD? If he was the present caesar at the time of Revelation's writing, the one "who is", then it would be the one after him who was supposed to last a short while. Titus did in fact last a short while, only 2 years, dying of natural causes in 81 AD. But Domitian then had a good long reign from 81-96 AD.
This is where the period where I think Revelation's prophecy failed to pass. What's interesting about this interpretation is that, if the prophecy was that Nero redivivus would succeed Titus, then that means Revelation had to have been written before 81 AD when Domitian succeeded Titus. And it had to, of course, be written after 68 AD when Nero died. That time range would tend to indicate that Revelation was likely written after Jerusalem's destruction in 70 AD.
However, I agree that it's odd that, if this Rome-centric interpretation is correct, then the destruction of the Jewish center of worship is not addressed. I still have a lot of reading to do on this subject so I am not making any claims of knowledge here. Perhaps a simple explanation would be that Revelation was written in 69 AD, amidst the fear and confusion of rulers being overthrown, and before Jerusalem was sieged.