Well, Otis, I have received your latest two epistles in the mail recently and took some time this past week-end to do a little preliminary investigating of them.
I'd like to know who sent you that Descendancy file on 'Robert A. Abernathy III' that had such an astonishing number of outright errors, unproven assumptions, cross-linked families, and severe conflicts, beginning with a clearly obvious mistake in each of the first 4 lines. Indeed, the error count was in the double digits before reaching by page 2!
If that's the best the person can do, I don't think I'd trust any data from them as far as I could throw a full-grown elephant.
As for the copies of the Macon County AL census records, I do have to thank you for the addition to my lexicon of not one, but THREE totally new ways to thoroughly mangle the spelling of the Abernathy surname. It's no wonder I couldn't initially find them on that census, given those sadly maligned spellings.
But you still haven't demonstrated a positive link between the David found on that 1850 Macon County Census and any earlier possible ancestor. On the basis of the information you've sent me so far, I seriously doubt that any professional genealogist would risk their credibility, reputation, and standing in the genealogy community by endorsing your hypothetical pedigree back to this 3rd Robert of the Virginia lineage, since you really haven't proved anything prior to the 1850 census, just thrown around a lot of disjointed facts that may bear utterly no relationship whatsoever, one to the other.
I also want you to know that I am hardly likely to quote you on any of your assertations, since I tend to require a significantly higher standard of accuracy in those whom I quote than you have so far demonstrated.
It is, however, encouraging to see you shaking your family tree to the point of fleshing out more recent generations with some success. I do hope you have recorded which relative provided you with which bit of data in each and every instance. But I tend to doubt it.