There is no fundamental difference between the NWT 2013 edition and the NWT, 1984 edition except that the latter edition states that Hoshea "he ruled" for nine years. Both editions translate the Hebrew as indicating that Hoshea began in the 12th year of Ahaz rather than ending in that year as you mistakenly allege.
The fact of the matter is that the Chart on page 1747 of the NWT, 2013 edn shows that Hoshea became king in c.758 BCE according to 2Kings 15:30 and this in the opinion of chronologists was an Interregnum up to the establishment of his reign in c.748 BCE which was the Ahaz' 12th year of vassalage under Tilgath-Pileser or the 14th year of Ahaz' actual reign.-2Kings 17:1. cf Aid to Bible Understanding,1971,p.344-5,ftn.m
Thus there is no inconsistency between the data of 2Kings 15:30 and 2 Kings 17:1. The nine year reign of Hoshea as the last King of Israel ended with the Fall of Samaria in 740 BCE
The chronology for the Northern Kingdom is fraught with difficulties which has created much scholarship since the time of Thiele and that is why celebrated WT scholars have properly made a' suggested' chronology for this period. That is why ii is stated that such a scheme or outline shold not be" viewed as an absolute chronology but rather as a suggested presentation of the reigns of the two kingdoms. In examining the chart you will see that nearly all of the reigns for the Northern Kingdom are prefixed with the Latin letter 'c' which means circa-about.
There is much divided opinion as to how the Hebrew of 2Kings 17:1 shoukd be rendered ito English. The first paper which dealt with this problem was that of Edmund Parker in his article 'A Note On The Chronology Of 2Kings 17:1' wherein he claims that Hoshea 'had reigned' rather than the' reign beginning' as NWT and most other translations adopt.
Leslie Mc Fall in his lengthy paper 'A Translation Guide to the Chronological Data in Kings and Chronicles' discusses the problem in greater detail and states that "The syntax of the Hebrew is more flexible than the English versions allow for it permits either a terminus a quo or a terminus ad quem". So your criticism on this verse fails.
Further, we calculate the reigns of the Judean on the Nisan to Nisan basis applying the same methodology to that of the reigns of the Kings of Israel rather than your claim and that of other scholars that Judah used the Fall system and Israel used the Spring system. Matters of such calendation are contentious. Simple is always best.
The length of the reigns for the Northern Kingdom have little to do with the 390 year period of Ezekiel because that period is applicable to Judah and provides auseful yardstick in constructing a chronology for the OT. If memory serves me correctly I believe that in your published Chronology Charts- 2004-2009 Jeffro agreed with the WTS position on this matter with a figure for the whole period approximating our position.
Your claim that JW Chronology cannot be reconciled with itself for the following passages in 2 Kings is simply bogus for our publications explain these anomalies for that is what chronologists seek to do to make sense out of the data. That is why for instance Thiele titled his research 'The Mysterious Numbers of the Hebrew Kings'.
scholar JW
There