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I am not a cryptologist - only a person who agrees with the legrand.
Supporting evidence? I mentioned the superimposition of the tarantula onto the top of the mansion this legrand is lead to. That's a start.
I, myself, have supporting evidence for a lot. And, in response to your "bring it forth" request: OK...
So you have evidence that explains why James Beverly Ward would put forth the effort and expenses to copyright and publish THE BEALE PAPERS dime novel pamphlet about a treasure in Bedford county, Virginia that is really about a treasure in a mansion in Pennsylvania.
You may with "Legrand" , but "Legrand" has NOT been able to establish a legitimate connection to James Beverly Ward, and without that connection, red knee tarantulas and mansions in Pennsylvania have no relevance to the Beale narrative story or to the two remaining unsolved ciphers.
What can be connected to James Beverly Ward are all the thinly veiled references to events in the extended Risqué family bloodline, beginning with Ward's grandfather James Beverly Risque's duel with Thomas Beale concerning niece Julia Hancock who later married William Clark, to the massacre of Ward's great uncle John Pickrell Risqué by Indians while inspecting gold and silver mines in Arizona 2 years before the dime novel pamphlet's publication. Combine that with Ward's wife being born and raised "4 miles from Buford's" and her relation to Robert Morris and his wife Sarah Mitchell Morris, Ward spending time in St Louis and the Shakespeare "Game is worth the candle" reference as a homage to his father, Giles Ward, a Lynchburg thespian and co -owner of Ward & Diggs Booksellers which sold several books which influence Ward, including Poe's THE GOLD BUG- all was apparent to the 1885 buying public of Lynchburg where the BEALE PAPERS was ONLY SOLD.
Then there is the review that appeared in the LYNCHBURG VIRGINIAN, April 10, 1885/PAGE 1,COLUMN 3, written by Ward's cousin and printer of the BEALE PAPERS-
"The BEALE PAPERS has just made its appearance in this city and contains what are said to be an authentic statement in regard to an immense treasure buried in Bedford county, near Buford's..." no mention of a Pennsylvania mansion.
And where did the HART PAPER state where the brothers searched for the Beale treasure?
And Pauline Innis GOLD IN THE BLUE RIDGE?
Not in a mansion in Pennsylvania based on a speculative mention of an arachnid.