Shish/Opo/Ryu is the scumteam because there has been no hard bussing between any three, in fact, there has hardly been any bussing at all, and throughout the entire game they have all been jovial with each other. The only bussing I've found was that this Day Opo said that he was confident I was mafia and the third guy would be in Ryu/Moy/Kon. But that's still three people, so he isn't even exactly suspicious of Ryu.
They've been jovial because they've always stuck up for each other. After Shish vs Uni D1, Ryu was the one to suggest that Shish's abrasiveness doesn't seem like scum motivation. When I questioned what Ryu meant when he told me that I wasn't sticking my neck out, Shish was the one to tell me. During the Ryu wagon D2, Shish opposed hopping on. After the gambit, Shish started townreading Opo.
Minimal bussing, good chemistry, and suspicious behavior from all three (Ryu's whole playstyle, and some of what Shish/Opo has said, like how Shish said it's either me or him, how their reasons for suspecting me are similar, and how Opo tried excusing his inactivity with a reason that didn't even exist at the time of his inactivity) lead me to believe that this could be the scum team. The only thing against it is the gambit I think, but I still believe it being fake is a possibility.