Мафия. Learning to Live

Let's take turns sharing our guesses until the new night arrives. Besides the clues, we don't have anything else, so we need to use them somehow. So:
1. Fish scale - it could belong to Drakoshka, Vistrit, or Nayra Drake; I hope I don't need to explain why.
2. Rag - I don't have many ideas here, as I don't know you all very well:rolleyes:
3. Test tube with liquid - I would suspect myself, but my picture shows a cup of red compote, so let's keep looking.
4. Nonsensical signature - the only thing that comes to mind is Kesh, not in the sense that his profile is nonsense, but in the sense that his signature "Fathers and Sons" may indirectly refer to this inscription.
5. Dialogue - it seems that in "Star Wars," the Jedi's opponents called each other "master," "lord," "sith," and so on. Also, Revan has a gun in the picture, and it seems that he could have shot Zubr with it, who, as a normal deceased person, is quietly silent and doesn't write angry comments)))
That's my reasoning. Does anyone else have any ideas?