So we come full circle.
What do we learn from Jim Bark? From this letter we can glean his thoughts, right or wrong.
Many will go through tortured logic and contortions to hold to long held beliefs. Such is the nature of things of this sort. But; I believe, an unbiased reading points only in one direction. Was Bark right or wrong

I don’t know. All I know is he was a man on the scene at the time and had a first hand look at the evidence and the players.
He discounted entirely that Dick Holmes was with Jacob Waltz when he died. We learn Bark had a low opinion of George Holmes’ reputation and considered him less than trustworthy. Bark tells us that was also the consensus opinion of the entire town. We learn that Bark was of the opinion Gideon Roberts liberated (for lack of a better word) the candlebox from under Waltz’ bed, not at the moment of death, but by burglary the following day during Waltz funeral.
From the totality of this we can, I believe, draw an opinion that Bark would have discounted entirely any later renditions of Waltz gifting the candlebox to Dick Holmes, and would have made highly suspect any clues supposedly passed from Waltz to Holmes. If any part of these opinions held by Bark are true, the premise of the Holmes Manuscript that the clues were passed directly from Waltz to Holmes fails. Were they passed to Roberts? And from Roberts to Holmes? We don’t know, but if so, that adds another layer between Waltz and any clues.
To a lesser degree we also learn all the ore from the candlebox may not be a rich as we have been lead to believe. If Bark is correct that he “feels certain” he saw Holmes and Roberts pounding that same ore from the candlebox in a mortar (at some time subsequent to the funeral). We can make a reasonable conclusion that, at least some of the ore from the candlebox was not of the type and richness of that from which the matchbox was made. As Frank tells us, Herman confirmed that was Rhiney’s statement as well.
The upshot of all of this is that the matchbox ore may not be typical of what was under Waltz bed, but a one off rarity. In fact, it puts some reasonable doubt in play that the origin of the matchbox ore stems from the Waltz death bed cache. Hal, by associations among the participants and the holders of the matchbox, has added another layer of doubt of that assertion.
To me, what it means is everything we thought we knew is built on a very weak foundation.