There are two types of players. Aggressive and passive. JKangaroo or Marnixxie, for example, is much more aggressive. They're going to be the types that help lead the game, scumhunt, and take sides.
Passive players are going to be the ones that usually abstain and want to wait til the next day to figure something out, and don't want to take the risk of pointing fingers. As well, they'll most likely sheep other players who seem to know what they are talking about rather than forming their own hard opinion.
The behaviors of both types carry through being mafia, so both quiet and talkative players are likely to be Mafia.
As well, Power Roles will tend to be talkative or quiet based on their play type, and both are equally likely to be either because of WIFOM elements.
And so I'd like to eliminate the players that would be passive. Passive players, being honest, are more likely to accidentally sheep the mafia and refuse to form a good opinion themselves.
So basically, everyone should keep talking else I'll maybe push a lynch on you ;]