Could others have ruled between the reigns of these kings? If so, additional years would have to be added to the Neo-Babylonian period.
The Watchtower would have us consider that there are 20 years worth of missing business records?
The November 2011 had just shown that, rather than there being gaps, that the dating of some business tablets overlap two reigns?
How does the possibility of a "gap of years between kings" follow from that?