This is a joke, not a complaint but ...
The journal included with the Arthur figure includes a sketch of Arthur's grave. How'd he manage to do that? He sketched his tombstone while he was still alive? Maybe that's how John knew how to make the tombstone, Arthur already gave him the idea on what he wanted it to look like.
In all seriousness, it would've been cool to have the Arthur version of the journal included with Arthur, with a few blank pages at the end. Then the John figure could come with the same journal, with John version of the sketches at the end.
I'm sure someone else will/could offer such a thing, but I digress ...
I keep telling myself I'm going to make my own version of the journal in 1:1 scale, now that I figured out how to get into the game files, but still ... that's a lot of work.