Along the way, he is researching the lineage for his own maternal ancestry, as well as his wife's family (both paternal and maternal) in order to create as complete a picture as possible for posterity.
The Crawford surname origins begin in Scotland a thousand or more years ago (around 1100 A.D.), and through DNA analysis have been discovered to have multiple branches that Jon does not relate to until 1300 A.D. at the latest, with an outside chance of connecting all branches together somewhere around 548 A.D., well prior to surnames being in use or the existence of "Crawford" as one of the options.
The ancient clan lines include the descendants of Auchenames (haplogroup I1), Kilbirnie (R-DF13 or R-CT4169), Ardmillan (R1b). The lineage split between Kilbirnie and Ardmillan seems to be around L-151, which originated around 5,000 years ago. 
His known ancestors of that ilk are found in Pennsylvania, United States from 1701 A.D. and moved to Ohio sometime around 1760 or so, where they have remained until only the last hundred years or so when mobility became much easier. Some portion of the family remains in Ohio until the present day.
It has been documented here on WikiTree that Jon's family is descended from (David Crawford II (1662-abt.1762)), but Jon believes that to be untrue as he belongs to a different Y-DNA haplogroup than other tested descendants of David II.
James Crawford (1701-1749) is not listed in David II's will (his supposed father), who lists even sons who have died prior to him, as he passes on belongings and slaves.
Previously mentioned DNA results indicate that Jonathan Crawford (haplogroup R-BY200574) does not descend from the same Paternal lineage as David II's documented descendants from other sons (haplogroup I2-BY3099).
There is no reason to suspect a NPE (Non-Parental Event) on either side at this point, other sources seem to be clear on the relationships.
Jonathan Crawford has matched with several other testers on FTDNA, but none of them match with David II's descendants, and no common ancestors have been found back to 1700. Current testing indicates a probability of a common ancestor somewhere between 1500 and 1700.
The exact point in the lineage where the incorrect relation exists is still under debate, but Jon believes that James Crawford (1701-1749) should not be listed as David II's son, for the following reasons:
Documented, sourced cousins with ancestry back to Josiah Crawford (1735-1797) (James' son) report that they have matched via auDNA to descendants of Guyon Morrison, Josiah's father-in-law.
Only two descendants of Guyon are on WikiTree with GedMatch IDs, and neither match to cousins under James (although they are 7th cousins, so this is entirely possible). Additional information has been requested of those cousins to clarify their "matches". If there is none found, then auDNA matching cannot be used as positive evidence of a familial relationship at this point.
Guyon Morrison signed surety for James Crawford before his death, and also took part in the inventory of his belongings when he passed, so clearly was a close friend as well as father of James' son's wife. This seems to be a clear indicator that James Crawford is indeed Josiah's father, despite the lack of a clear birth record. (Josiah mentioned as "Josias" in James' will, hence the discussion of possible confusion)
Documentation back to Josiah Crawford seems to be intact, the link between James Crawford (b. 1774) and Josiah his father is solely through Josiah's will, but there is no reason to doubt its veracity or the link to this James.
This would infer that despite the auDNA matching difficulty to Guyon's descendants, the clearly indicated close relationships to Josiah's father-in-law should be proof of James' parental relationship to Josiah.
Once clarity is reached regarding Guyon Morrison's descendants matching, Jon will request that the paternal relationship between James and David II be removed, disconnecting this paternal branch from 1701 until the present from the overall universal tree until lineage can be proved elsewhere.
To aid WikiTree in the administration of my account should I be incapacitated, or in the event of my death, I hereby give permission for all open profiles I'm managing to be transferred to the following:
First-hand information, except when typed by the second hand. Never typed by the feet. A Moose once bit my sister.
Paternal relationship is confirmed by an autosomal GEDmatch comparison between Jonathan Crawford , GEDmatch kit # DT6008008, and Living (Crawford) Pope, GEDmatch kit # A449987 , his 2nd cousin 1x removed. Their most-recent common ancestors are Porter Crawford and Ella Foskett, the great great grandparents of Jonathan Crawford and great grandparents of Living (Crawford) Pope. Predicted relationship from GEDmatch: 2nd cousin once removed, based on sharing 32.6 cM across 3 segments.
Only the Trusted List can access the following:
Jonathan's formal name
full middle name (M.)
private siblings' names
private children's names (1)
spouse's name and marriage information
For access to Jonathan Crawford's full information you must be on Jonathan's Trusted List. Please login.
It may be possible to confirm family relationships by comparing test results with Jonathan or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 700 markers, haplogroup R-BY200574, FTDNA kit #954785, MitoYDNA ID T15160[compare]
Mitochondrial DNA test-takers in the direct maternal line:
Family Tree DNA mtDNA Test Full Sequence, haplogroup K1a11, FTDNA kit #954785, MitoYDNA ID T15159[compare]
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Jonathan:
Thank you for replying to my question. Your suggested approach is very important for one to keep in mind. Keep well my friend.
I don't know if you've stumbled across our match (I am GEDmatch no. AN2812146), but we have a very interesting one, and I believe that it's possible that we descend from multiple common ancestors going back from your ancestor Lynn Wilson Crawford (https://www.wikitree.com/wiki/Wilson-72622), including the Wilson and/or Wood lines that may match my Wilson and Wood lines going back from my great (x3) grandmother Sarah Hollett Hibbs (https://www.wikitree.com/wiki/Hollett-240), your Huff or Hoge lines that may be connected with the Jacob Hough or Huff of Maryland (https://www.wikitree.com/wiki/Hough-2471) who married my ancestor Jacob Smith's sister Charlotte (see my great (x3) grandfather Thomas Dicken Smith's line (https://www.wikitree.com/wiki/Smith-102794), and perhaps also your Gillespie line, that could be connected with my same great (x3) grandfather Smith's Harwood (and Taylor) ancestors (see another Gillespie line back (not mine) (at https://www.wikitree.com/wiki/Rayburn-160) with which I have very strong matches in Chr. 16 near our match). Please let me know if you would like to explore these possible links, they're pretty interesting. Cheers! Best, Patrick
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Looking forward to researching with you!
You and I are 7th cousins, both of us descending from Margaret Wilson and Guyon Morrison 1705. I am quite interested in your work in proving that James Morrison is the father of Guyon. My dna tests are here as well as my father Charles Cable who will be a closer match to you obviously. Thank you, let me know how the Morrison’s are shaping up!