What is the author's opinion and conclusions based on the Documentary Hypothesis?

After many years of research, I have come to the conclusion that we must take each tradition in the Source/Documentary hypothesis in phases. By partitioning each tradition into sections we will have a better understanding of the timeframe to which the scribe may have belonged. This gives us a chance to concentrate on the details of each sections; details as small as names of locations only mentioned once or twice throughout the entire Pentateuch.

In my first book, An Adopted Legacy: Neo-Assyrian Origin to Hebrew Lore, I have started to partition off the Yahwist (J) tradition into J1 and J2.  This is NOT to be taken as two separate authors. J1 covers the primeval portion of the Pentateuch (Gen. 1-11) while J2 covers the ancestral portion of the Pentateuch (Gen. 12-50). In the second book of this two part series J2 is discussed in more detail alongside the Elohist (E). After my research of An Adopted Legacy: Neo-Assyrian Origin to Hebrew Lore completed I was able to determine a timeframe of writing for the Yahwist between 721 BCE - 586 BCE. J2 in the second half of this research confirms the findings of the first volume, of this series while attempting to better identify how the Elohist fits into the scene.

UPDATE: In my newest installment, Biblical Origins: An Adopted Legacy, this date is further refined to the timeframe surrounding the reign of Hezekiah; specifically between 701 BCE to possibly the end of Hezekiah's reign in 687 BCE. This was during the reign of Sennacherib, king of Assyria and the Neo-Assyrian Empire that controlled the Near East during this period.