Something I don't think I saw people mention on the previous thread is that the lines on Miura's drawing are probably grid lines. In art, you'd use the grid method if you're referencing/copying a different work, so things are roughly in the same position as the original artwork regardless of the size of the medium (e.g. a mole is located at c6 on a huge canvas, so on my napkin the mole has to be located there too)
Now, I don't know why Miura(?) would copy his(?) own art, but you can tell the original painting was done the day of the murder (knocked down wood-fence). If it was Toyokawa I guess it would make sense, but the whole point of the grid method is even a beginner would be able to do a better job copying than that, unless it turns out he has really shaky hands or something.