"Once a again, is there any evidence outside of the pamphlet that can show the chain of custody of the ciphers and then the story from Beale to Morriss, then from Morriss to "unknown" author, and then from the "unknown" author to Ward and Sherman?"
Obviously, the only place that lengthy string exist is in the pamphlet story. We could only hope that we could eventually arrive at all of that outside of the pamphlet, that's the whole point for the continued research efforts.
Again, as stated previously, I can't give you the final conclusive antidote that you desire. But what I can give you, and have given you, is some undeniable evidence is support of the theory presented that you've yet to produce evidence to the contrary. In fact a couple of your efforts have even helped make the theory stronger... Suggesting that the author simply grabbed prior information in the writing of his story is easy to do....but can you prove it? No, you can't. So while it's a strong theory, and even one that I've not discounted, it still can't be proved to the same measure that you expect/demand of others...