Finkelstein
The WTS's dating chronology such as it was established is really set upon theological interpretation, being 70 years of desolation prior to Cyrus overtaking Babylon in 539 BCE.
True to some extent. The correct understanding of the 70 year period is crucial for not only WT Chronology but also any Chronology that is to be based on the Bible or OT.
There is certainly a Gap of at least 20 Years but the Bible is quite clear that the seventy years was that and not 47 years so one should misrepresent history in that way.
scholar
The fact is there is a discrepancy of about 21 years, confirmed from archaeological findings, which confirms that the desolation was only about 47 years after the final destruction of Jerusalem ( 586 - 539 = 47 ) give or take a couple of years of flexibility to when the Jews actually returned to Jerusalem