Doug Mason:
Of course the WTS does not start its "70 years" with the destruction of Jerusalem but with the exodus of some Jews into Egypt, following Gedaliah's murder.
Correct. They say the '70 years' started in October of 607, whereas Jerusalem and its temple were destroyed in August. But that doesn't help their broken interpretation of Jeremiah 29:10 highlighted by their even worse rendering in the 2013 revision.
I say that the exodus took place 4 years after Jerusalem was destroyed.
That may be the case, but it doesn't accord with the Bible, including the interpolation from Babylonian sources at Jeremiah 52:28-30, which indicates exiles taken in the year the temple was destroyed, and 5 years later. Of course, there's no indication at all that Judea was ever actually entirely uninhabited (in fact, it's known that parts of Judea remained inhabited). Even Jeremiah 44:14 refers to "some escaped ones" who went back from Egypt to Judah, years after Jerusalem had been destroyed. In any case, the idea that it took place "4 years later" has no bearing on the JW interpretation.
On top of that, when Ezra later wrote 2 Chronicles, he said that the 70 years ended when the Persians defeated Babylon, not when people assembled at the temple site.
Of course. The Bible never mentions 70 years of exile, and Ezekiel explicitly states that they started counting the exile years before the destruction of the temple.
And further, no one knows the year when those exiles from Babylon made their journey - dates from 538 to 535 are given.
It is more than likely that the way the Bible tells the story of Cyrus' decree isn't exactly what happened. In fact, it's extraordinarily unlikely that Cyrus made any great proclamations about 'Jehovah', and considerably more likely that he had a policy of religious tolerance, and allowed exiles, whether Jews or from elsewhere, to return to their homeland and worship however they liked. But, again, according to the narrative in the Bible (and supported by Josephus), the Jews who were first permitted to leave Babylon arrived in Judea in 538 BCE. And whilst Cyrus' motive is almost certainly embellished in the Hebrew narrative, there's not really any compelling reason to believe the timing in the Bible must be wrong.
In short, if the Bible is correct, JWs are wrong, and if the Bible is incorrect, JWs are wrong.