Vecna, to my understanding has never before rolled scum. This means he has his town play well and truly entrenched. To avoid suspicion he then must copy that exact meta to avoid suspicion.
The thing I tend to not most about Vecna is that his posts are short and sweet, one question and he moves on.
This game, most of his posts (pre pg 20), are unnecessarily long and verbose. There is nothing to the point about them at all. It's textbook trying to imitate something. On page 20 I drop in with my "Vecna is hard scum". Following this you will note that his posts immediately become more succinct and to the point. 5 pages later he then calls me out "wishing that I would participate". I think this is him hoping that this would cause a town to pick it up and start my wagon.
He also mentions being bored which also tends to point scum as they have to information. Many other people have also done it though so more it adds to the case than it gives me the read.
Vecna sits as my 2nd scumread
In terms of connections, I felt as though this exchange between EMC and Vecna was very off
Seems like EMC as the new guy potentially not trying to piss off one of the "better players" and giving him a free out.