I see what you're saying about what is suggested to be a protein generating region of Cr15. However, I'll add these bits of info.
One matching segment (unidentified common ancestor) is a whopping 20cM. That segment triangulates with a 10cM segment with the descendant of Jane Marler.
Both of those segments triangulate with a 6cM segment that is present in a yDNA match of mine.
Yes, there are a lot of matches for this region. I could suggest an TMRCA of 800 years might account for this. I would be curious to hear Illumia's opinion on this topic. They make the DNA sequencing chips. We can lessen the weight this information has for now.
Now, if you couple this information with the fact that the identified autosomally matched individuals both descend from people who lived in the same place at the same time (Blackmore, Essex, England), and those families share a common ancestry, this can almost look like more that chance.
For one to claim that John Smith, Esq. didn't exist, you need to figure out to who then Christopher Barker issued arms and why the heralds continued to repeat the Smith/Carrington lineage.
Round appears to be the most vocal of all, and he's definitively proven wrong.
You still appear to want to agree with Round despite the fact that Hamo of Carentan actually existed. That he did not was one of Rounds major arguments.
Rounds arguments that the Smith/Carrington story is false are based upon:
To quote Round, "Not a scrap of evidence is produced to show that this Hamo de Carington ever existed in the flesh, and I do not hesitate to say that he is a fictitious personage."
To counter, I shall quote Butterworth: "Upon the death of Hamo the lordship of Carington passed to his son and heir Sir William de Carington, who was succeeded by his son Sir Jordan, [described as] “ fil Willielmi fil Hamonis de Carington.” This Sir Jordan was one of the Knights of Ranulph de Gernon, fourth Earl of Chester, and was present at the battle of Lincoln, the 2nd Frebuary, II4I, when King Stephen was taken prisoner."
So here we see a very clear descent of Sir Jordan from Sir William of Carentan from Hamonis of Carentan.
His suggestion that Sir Mychell of Carentan didn't exist is also errant:
To quote "Friends of Baguley Hall on Facebook" and their research posting titled "DE MASSCEY/MASSEY ANCESTORS OF SIR WILLIAM DE BAGGELEGH": " At about the midway point of the northern boundary on the Mersey River would be the river crossing to the City of Manchester original location in Lancaster, which lies to the north of Chester.
This probably marks the area with the greatest holdings of the Barons de Mascy in Cheshire. With these lands Hamon de Mascy had lesser Lords who held portions thereof for him or under his 'right'. Examples would be Adae de Carrington and Alano de Tatton. Both constituted Estates granted to Hamon."
Adae of Carentan sold the Parish of Sale to fund "Sir Michael of Carrington".
You can also refer to "The Visitation of Cheshire in the Year 1580".
Another interesting clue I can share is the family of Col. John Carrington Smith who married Charlotte Juliana Butler, daughter of a Viscount Mountgarrett and sister of the Earl of Kilkenny.
George Booth who married Jane Carrington also married Elizabeth Butler of Warrington, Cheshire.
Juliana and Elizabeth are of the same larger Butler family, descendants of Hervey Walter de Claire, progenitor of the Dukes of Ormonde.
But I get it. You want more proof. Ok. I'll see what else I can find.