Мафия 2. The City of Lost Heaven

Signature, signature! What's Zubr's signature?

Damn, I didn't notice it myself at first, I only looked at his profile. No, do you really think that the organizer would openly reveal the name of a clan member? Even if that were the case, think about it: why would Zubr himself give the clue to this inscription? Is he trying to incriminate himself? What's the logic? Look at the situation from a broader perspective!
In my opinion, Reven wants to confuse us, just like in that situation with the fish scale! Remember, everyone immediately started attacking the dragon... etc. It's confusing, but I think it's Stan after all!

Added after 52 seconds
So, Siv is also Mafia or a Man in the Middle, since he's incriminating himself =p