This has been discussed on several threads and links were provided on one of my OP threads. You even gave that a post a Like.
NOTE: The Beale Papers were published after Pascal and Francis Buford had passed away, so the only people who could be questioned about the alleged Beale stay at Buford's were their three children.
They all claimed to have no knowledge of nor ever heard a family story concerning Beale's stay.
"His (Beale) character soon became well known"-THE BEALE PAPERS
Doesn't seem like he was keeping his visits and stays secret, now does it?
Also you keep mentioning Col. Isaac Coles why could it have not been Edward Coles that left Lynchburg, Va. became Governor of Illinois after freeing his 19 slaves. There are others out there besides the two you mention. Robert Morriss, Chiswell Dabney and others were all kin to the Witcher's and the Cole's families. And they in turn were related to two or three Presidents of the United States and to several of the signers of the Declaration of Independence.
So I see no basis for your "purposeful discrepencies of plausible facts?"
Edward Coles was Col Issac Coles younger brother, and Issac Cole did work for two Presidents.
From family genealogies, several posted here, DOI signer, Robert Morris Jr, was not related to the Robert Morriss character of Ward's 1885 Beale Papers, as well as William Witcher and Edward and Issac Cole.
For the record, Andrew Jackson and Chief Justice Marshall were also not related to the Robert Morriss character.
"Plausible facts" are those based on speculation without any real substance beyond that of the presenter.
...and still with all the various genealogies, maps, notices in period newspapers, and the Washington House listing in the 1885 Lynchburg Business Directory, none of these presentations prove that anything in the Beale Papers story as actually ever happening outside of the Beale Papers.
In fact, the presented "plausible informational facts" do just the opposite.