Sloppy methodology for a 1 year difference does not mean the date must or even could be 20 years out. There should be a few non-WT affiliated scholars here and there that support 607 BCE. Can you name just 1 or 2 such scholars?
The reason for their confusion is their failure to account for the biblical 70 Years so it comes down to sloppy methodology.
Why should secular scholars take, not a biblical event, but a biblical prophecy into account...a prophecy by the way that is controversial in and of itself as this thread demonstrates? That would be sloppy methodology.
One non-WT affiliated scholar...is what I am looking for.