The following is an advice to the WT spin doctors: They can beef up their new truth with some support from the Bible.
The overlapping generation counting is used already in the Bible. After having applied this new understanding onto the generation lists for Moses and Joshua , we have concluded that Moses father was not his father but his grandgrandgrandgrandgrandgrandgrandfather. All the intermediary fathers were secondary in the eyes of the author and not mentioned, therefore he used the overlapping generation definition when he presented Joshua and Mose as living in the same era, even though they had eight generations difference. Joshuas eleven ancestors between him and Jacob were therefore perfectly matched to the four ancestors between Moses and Jacob. The overlapping generation explanation is surely a wonderful new light discovered by the faithful and discreet slave, rather much as the discovery of the book of Moses in the forgotten archives of discovered by the priest Hilkia. ( 2 Chr 34:14-15)
PS. This is a piece of information I discovered in the excellent book "Who wrote the Bible", by Richard Freidman