Thank you all for your stimulating thoughts.
I think my diagram might need to reflect the overlay that "the earthly kingdom of God" ceased in 607 BCE and was reinstated in the appointment of the Watchtower Hierarchy in 1919 CE. To me, that could be a starting point, rather than the Bible. Any number of bodies accept the Bible, but what matters to a JW is the understanding through the eyes of the WT's explanations.
If the Bible were "perfect/inerrant" there would be no excuse for splattering the word "Jehovah" throughout their NT. What is "perfect" is the WTS, inasmuch as it is in direct contact with God's heavenly government.
Thus their explanation of Evolution must be correct. How then do I produce a diagram that correctly illustrates their "logic"? Is there one? When I read their brochure "The Origin of Life", it appears to me that the author is saying "look at the wonder of the complexity, this proves there has to have been a designing engineer". Hence the reason for my starting point. Am I reading the brochure's intent incorrectly?
My supposition comes from the following, as well as illustrating the WT's simplistic dichotomy (Evolution or Bible):
“If evolution is true, then it should seem at least reasonably possible that DNA could have come about by means of a series of chance events. If the Bible is true, then DNA should provide strong evidence that it is the product of an orderly, intelligent mind.” – The Origin of Life, page 13
Doug