Well from what I read, there were two or three (it's being disputed) mafioso in the write-up, along with some vig groups. The game says there are four mafioso.

2 (or 3) = 4? I don't think that math adds up. Ergo, there could have been a mafioso in a vig group. Maybe two. Maybe there's a mafioso pair sneaking into a town vig group. Maybe there is a mafioso partnered with a townie, all used to establish credibility. I've seen that strategy used before, and I've used it before. People being in vig groups only proves that they were active.

That's where I disagree with you, Monty.