FTF
"they are all interdependent, intertextual references to the seventy years. The point was: the Watchtower's exegesis of what the "servitude" and the "seventy years" meant is not simply a reading of Jeremiah 25:10-12 but it is the end result of interpreting several intertextual seventy year references."
You ignore the whole point: you need to know what Jeremiah wrote in ch. 25 to correctly understand 2 Chronicles 36 & Daniel 9, as this is the prophecy upon which the other 2 are based. However, when Jeremiah wrote his prophecy in ch. 25, the other 2 verses were not written yet, so a correct understanding of Jer 25 does not depend on Daniel 9 or 2 Chron. 26. So they are not interdependant, as you put it, the dependacy is only one-way. Jer 25 is sufficient as stand-alone text, unless you have an agenda of course. The only reason C.O. Jonsson mention it, because of the fabrications of people like you, and the society you want to defend.
Concerning LXX: why are you not providing a comparison text with the masoretic texts? you only provided different English translations of LXX, which is already a Greek translation from a different language, how old the translation is, does not take away that it is a translation, with its inaccuracies that come with any translation. I stand to the point, anything you want to prove upon that basis, is worthless if you choose to ignore what was written in the original language.