You make a solid case Lewwyn, but one thing makes me think Greyblades (probably) isn't scum - his earlier claim to be Doc Brown, and that he knew the identity of issaikhaan as Marty McFly. Evidently he was correct on the second point, and I find it unlikely that mafia and town would be partnered in a mason role. It's not impossible though, I'll admit.

issaikhaan, could you reveal any previous private conversation you have had with Greyblades? Did you know his identity from your role PM?