Ok, I'm finally beginning to feel a bit better - (lots of cups of tea ftw) so I'll try and do some analysis.
First, don't lynch me (I'm really sorry for not posting, but I didn't actually eat anything in 67 hours so I had no energy for trying to sort my way through stuff)! Second, what exactly is a mafia traitor? They seem to work with the mafia but the mafia doesn't know who they are (mafiascum is down for me atm, so I'm using the definition on wikipedia)? And as weiyaoli was an sk as well, where were their kills (unless the silence was weiyaoli, which would make sense if they started out as a normal SK, then got turned into the master after killing him)?
Moving on from that as it probably doesn't matter all that much - we seem to have had independent scum which has probably acted to balance out the fact that we seem to have so many of them (conman, weiyoali, greenlover, webby and presumably at least one more as the game's still going) (here I'm counting weiyaoli as an independent scum, conman and greenlover were probably at least linked in as much that conman probably knew who greenlover was from what the mafia-traitor role seems to entail, and webby was definitely just an SK). I'm guessing that there is only one scum left - GoP, Keeneal or Chandani (since Mav is basically confirmed Doctor now, and I"m pretty sure FaoT is town as well, as they seem to have been the one to manage to fix the who paradox mess, though I guess we'll tell tomorrow, if they don't die).
As for GoP, keeneal, and Chandani - my gut seems to think that either Chandani is scum (as Harriet Jones seems to be rather weak), or keeneal, as they seemed to rush the time travel to go back and possibly lynch Mav. I know that they've claimed River Song (who flavour-wise is the one who is supposed to kill the doctor) so it could be that instead of having a win-condition of the doctor being alive at the end of the game, their win is actually based on lynching the doctor. Webby said that they were able to false-claim Amy (and we haven't had someone else claim Amy now that we've all had role-claims out), so it's possible that keeneal could even be the dalek (as dalek's can time travel) and has been given the identity of River Song as a cover.
'Look, sir, I know Angua. She's not the useless type. She doesn't stand there and scream helplessly. She makes other people do that.'
GNU Terry Pratchett