That is useful, Doug. When first reading up on this, I never bothered to go through the details of what type of “year“ is being referred to in each biblical passage and what the effect is. A lot of work to decide between 586 and 587. It was enough for me to see it was pretty clear that Watchtower chronology was hopelessly wrong, and CT Russell should have picked that up right at the start, because (for example) when writing “The Time is at Hand”, he refers to Ptolemys Canon.
Amongst the excellent and thoroughly researched articles I have seen (eg Gentile Times Reconsidered), there is one point I have not seen highlighted, as follows.
J-dubs like to say something like, “Well secular history might lead to 587BC, but the bible says 607BC.” Actually, secular history makes no mention whatsoever of the destruction of Jerusalem. There is, for example, a Babylonian tablet recording the siege of Jerusalem in 597 BC (recorded in both the Bible and Babylonian Chronicle), but the relevant Babylonian tablet for events of 587BC has never been found. We only presume the destruction of Jerusalem occurred because the Bible says so.
So my answer to “Well secular history might lead to 587BC, but the bible says 607BC”, is that there is no secular history, and the only date you can get from a literal reading of the bible is 587BC (or possibly 586BC).